Am I crazy ?

I’ve been with this guy for a year and a half. A “situationship” I would say. He has an ex who had a baby while they were together (not “his”) and the baby passed because she had pneumonia that doctors never diagnosed. They broke up because they got into a bad fight (he claims they got really toxic after she died and they used to throw stuff at each other and stuff. And he had a hole in his door that he says he punched) and her parents called the cops. I tried not to really get involved there because I couldn’t imagine how I would feel if I had an infant die. And she has a boyfriend. But I definitely have felt weird about different things. At first it was just present for father/Mother’s Day, okay cool. But then it was also birthdays. And then he would have her over and he’d make dinner for them. I felt weird because he’s never done that for me. A couple times a while ago, he blew me off to hangout with her. But now they don’t really hangout anymore all of a sudden. But on Friday, I asked to see him but he said he was busy with his friends. They were looking for Pokémon cards and video games. But then he texts me and is like “you’re gonna be mad but (ex) is hanging out with us. She’s using my oven to make a cake”. I immediately rolled my eyes. I WAS mad because ONE - I’ve never met his friends except for one. He says he wants to introduce me to more but we “fight too much”. TWO - I hadn’t seen him for a week at this point. So he blows me off but the second she needs something he just does it?? I had this idea to ask him if he’s ever talked about me to her. He tells me that she knows he’s talking to someone but doesn’t know any details of anything at all. I decided to test that idea and added her on social media. He immediately texted me and was like “why would you add her? She saw it and showed it to me” and I was like “I thought she didn’t know anything”. He said “that’s not what I meant. She knows your name and some stuff about you”. That’s NOT what he told me before. And how would she know enough to recognize my profiles? ALSO spent 8 hours with them. THEN the day after, we got into a fight and he was ignoring my texts but sent something to my Facebook by accident and then unsent it. He said he meant to send it to her because she was trying to ask him to gift her something on pokemon and he said he already did not that long ago. 😐