Is he cheating with coworker?

I know no one can really tell but PLEASE I am really hurting inside & would like opinions… Since I was pregnant this coworker of my boyfriends has been crossing boundaries in my option. For context my bf works with children’s behavior so he works in daycares & at clients homes. Last year one random day I am calling my phone with his & see a text from a girl I’ve never heard of before, it was along the lines of “Story time! Blah blah blah” with this long paragraph of her talking about catching a fish with a picture attached. I asked him about it and found it a little odd because my bf is really shy but wrote it off. He said it was some new girl he barely knows. I definitely thought that would be pretty weird to text someone you barely know.. A few months go by & I am noticing this girl texting him for non work related stuff quite often. “I wish you drank, I could use about 6 beers after today.” I definitely wouldn’t ever think about asking someone I know doesn’t drink to go out and drink, but especially not one with a pregnant girlfriend (WHO CANT DRINK) I got pretty annoyed with this. I confronted bf & he is basically saying “I don’t want to be rude, I just didn’t answer her.” Ok noted. A few weeks later I see him looking her up on Facebook. She asks him to grab her something at Starbucks & he doesn’t accept the $ from her. (We split basically everything) I’ve been cheated on right before getting with him so I admit sometimes I am engaging in toxic behavior by looking through his phone, ok I know. But I did it more.. i see a text from his boss letting him know that said girl had SO many great things to say about him, that he is so great with the kids & is just amazing at his job. And that she wants to start bringing Spanish food for him to eat. Full stop. I am not dumb, alarm bells went off in my head. He of course minimized this & acted like this is whatever. There were a few more ridiculous things shes said in that time frame I probably blocked them out due to being enraged. More context, I found this girls TikTok & she has several TikTok’s alluding to making other girls jealous & “needing to stay blocked for their relationship to work” something about sarcastically saying her and someone are “just friends ….. with benefits” The dates were from before they ALLEGEDLY met, seeing as I have no idea when they officially did. My bf is the type to withhold & not mention stuff to not make me angry. His mom works for the company & knows about some of the issue. She calls me one day to talk when she knows we’re fighting & tells me I have nothing to worry about because the girl is a lesbian. I LAUGHED I am bisexual myself & my gaydar is pretty accurate & I just knew that was not true. Months go by & she, sure enough, is posting that she’s dating a man. And the man has nearly identical features as my boyfriend. (Long, red beard… I mean cmon) Well, I had the baby & have been so overwhelmed I didn’t have the time to worry about this situation. Our intimacy has diminished, he sleeps on the couch & claims it’s bc the baby. We don’t kiss, we have been nice to each other but it was definitely feeling like being roommates. I am so stressed all the time, I have to demand help at times so I can imagine him not being super attracted to me in those moments. I have not had the desire to have sex due to being touched out from breast feeding, I also have pain during sex, and I’m just plain EXHAUSTED. I work on the weekend & take care of the baby by myself from 6:00am-6:00. I hardly ever have a moment to myself. I knew a baby would strain our relationship but wow, I didn’t know how fast it would happen. I’m not dumb, I know that when men feel “appreciated” by someone new it’s nearly impossible for them not to fold, I can only imagine when their partner is consumed… but with their baby?! You would think they could hold off.. Fast forward, I randomly started having dreams about him cheating with her & I never dream. I started getting sick with anxiety & looked through his phone after months of not doing it, he came in the bathroom where I was and I nervously put his phone back but I knew he knew I was going through it. That night he slept with his phone basically in his pocket, for months he would fall asleep with his phone in the open right by him. I demanded to see his phone & there was a few things I thought were odd. Her: “What are you reading? Kristen told me you read.” Her: “wanna come join the party?” Him: “I was waiting for the invite 😒” A general text gushing over how GREAT of a therapist he is, and that their boss doesn’t just hand out compliments (she does, believe me) The second one almost gave me a heart attack. ALLEGEDLY, he & her get supervised by their boss occasionally, and the boss & the girl were waiting in the car in front of a clients house waiting for the parents to get home… I was annoyed but felt dumb like ok I thought there would be more. This morning I take his car to get coffee, I look down and see two bracelets in his car that I’ve never seen. I bring them in and ask who’s they are, he says “___ got them for us on vacation with her boyfriend.” …. Really. The fact he had to specify that, wow… apparently she bought them for everyone… 2 bracelets for everyone… while vacationing with her own bf. I just need some direction. does this sound like a misunderstanding? am I being paranoid? He is suggesting we go to therapy because I am so besides myself over this.