Am I mad?

My daughter’s dad cheated while I was pregnant and from what I know it was up until I was around 6 months pregnant.. it was with a colleague I also must say. During that year he went off sick from work for several months up until my due date, so around that time in work that I know about.. I found out he had cheated when I was about 8 months pregnant but I never addressed it because I didn’t want to send myself in early labour etc.. I had also snooped and could account for all his actions once I had our baby girl. However in November I snapped and told him that I knew and we had a huge argument.. he wanted to just brush it under the carpet and move forward but it was never that simple for me, so when I kept wanting to talk about it and get answers I deserved he then decided that I would never get over it and that he didn’t want to live like that, and decided to end things with me and him several weeks before Christmas .. Oh.. I must also add, the person he cheated on me with, had passed away a week after me and him split up - circumstances unknown.. Since then in the early days we had some really toxic arguments but as of lately we’ve just been amicable and he sees his daughter one day a week which is his own decision and we spend occasions together as a family - eg. We went out for Mother’s Day, I spent Easter at his families home etc. I’ve been wanting us to work things out for a long time but he seems to be really adamant that I’ll continue to throw things in his face due to things that have been said during arguments and that we will not get over it.. Anyway.. my point is - I wanted to go on holiday this summer with baby girl and he said he wants to come - it’s the first time since we’ve split up that we’re going to be staying together again and being around eachother for such a long period of time.. Am I crazy for bringing him on holiday with us knowing the circumstances could get messy etc ? Thanks!