Am I the sidechick here? Am I being delusional?

I met this guy over instagram. He has a baby mom and a son. He lives 3 and a half hours away from me but he’s made time for me he has visited me 3 times and usually stays Saturday to Sunday.

I received a message from his baby mama saying that that’s her boyfriend, she sent me screenshots of him saying he loves her and pics of how they live together with they’re son. I confronted him and he told me it was from agies ago. She’s messaged me many times saying thays her boyfriend and that they’re having a baby together, he said she’s lying. But I am in a groupchat called are we dating the same guy and he’s been posted multiple times from 3 different women about how he’s a liar and a cheater but if he is lying he’s doing a good job lf it?

I’ve not met his son or his family or been to his, he’s met mine. I don’t see him in the week only every 2/3 weeks but he’s taken me on a date. He tells me his baby mom is crazy but I don’t know what to believe? She is a prettty woman but of course pretty women can be crazy too

Am I the sidechick here? Am I being delusional?
Post Opinion