Am I wrong for being upset?

My partner mentioned a few months ago that he may be taking a trip out of the country with his parents but did not provide any details until last week. He tells me that they are leaving Tuesday and that his flight is 17 hours and he’ll be gone 11 days. So that meant I had four days notice to prepare. I work from home and have two very young toddlers. He works a different shift than me so he’s able to be with the kids while I work. So I’ve had to use all my available PTO because he did not think to make any arrangements for our kids. I asked him multiple times what time his flight out was and he told me 6pm. So my plan was to work that Tuesday until it was time for him to leave. Welp, he was wrong and his flight actually left at 6am which threw another hurdle for me to tackle. I just couldn’t imagine being out of the country for 11 days and not even being considerate enough to make arrangements for my children. Just left everything on me. He didn’t even say goodbye to our kids. It’s now been four days and I’m at my wits end. I don’t have any family or friends. I’m overwhelmed and stressed out. My youngest is going through a sleep regression and my oldest misses their dad. Every time he’s asked to talk to him he never answers the phone but then calls at 4am our time expecting us to be awake and ready to talk. My oldest has now started saying that daddy isn’t coming home. This entire ordeal has made me look at my partner differently. Almost to the point where I want to end the relationship. Not once has he even bothered to ask me how I’m doing. He simply wants to talk about all the exciting things he’s doing. I tried to mention to him today how exhausted I was and his response was “moms have been taking care of kids by themselves since the beginning of time “ he doesn’t get it. I’m so tired. I have to go back to work Monday and mange to keep my kids quiet all day. I just don’t get why someone would leave and have no regard for their kids. It’s ok though. I’m a mom. Moms are tough.