AITAH- confront this or give up realize I’m not in a relationship?

I’ve been seeing a guy from a dating app. We’ve established we’re in a relationship. What’s weird is he moved in with a female friend and ever since he came back from this other thing where I found out he met with his ex who he’s still in touch with, and another female friend, he’s been cutting plans with me short. He’ll make more frequently plans but just want to leave early. He’ll say he’s gonna nap or he has to do something. One time really recently he just left super abruptly. I brought that up, especially since he’s canceled plans. And his response is we should meet up less after work because we live far apart and he has a life. He said he’s really busy.

Yet every time that friend he moved in with visits family, which now is Friday and sometimes Saturday, he’ll stay out longer then. And usually he cuts things short at 8-9pm sometimes a bit later. But recently he’s wanted to stay out past midnight. And his sleep schedule didn’t come up as an issue then. I’m really worried he’s seeing other people and I’m just filling his time. Especially because when we first began dating we saw each other once a week and then we ramped it up to twice a week, sometimes I’ve been seeing him thurs-Saturday or Friday-Sunday and maybe during the week. But now he’s said we can just see each other less? I don’t get it.

He also said I’m a student (true) so I don’t get how work can get. Which isn’t true because I work as well. So I didn’t fully get his comment. It feels like something is off. When I first began seeing him he didn’t do this thing where he has to run off early. But sometimes I’ll see him weekends and he will do that too.