Is it just me overthinking or is there something to really worry about?

Me and idk what to even call him anymore we were together an then he moved out an wants to do this "just friends" thing right now but he says its just till he gets back on his feet then I guess he wants to be back together. Well he left cuz he went out an got trashed with some friends and cheated on me, he told me about it even though he doesn't really remember wat happened but its wat everyone said happened and Idk any of the people he was with so he didn't really have to tell me cuz I never would have found out but he did cuz he felt so guilty about it. But now his staying with his ex and he says that theres nothing goin on or anything but he keeps tagging her in all these facebook post an he never tags me, I mean Idk y but I still trust him but it just keeps getting harder to . . . I mean he cheated is living with his ex an keeps tagging her in all these things I just don't kno. wen he comes over to see me he really seems like he still really loves me an wants things to work out between us but anymore im startin to wonder if he really does or if his just scared that ill keep him from his child if he doesn't (im pregnant with his baby right now) I would never keep him from the baby cuz it wouldn't be good for the baby btw. So idk am I just worrying about nothing or wat . . . any advise would be really helpful.