what should I do

First, I'm 21. The guy I've been dating for about 2 years is 32. We'll recently he got locked up for a few years.. Long story short after he got locked up I found out he's been still messing around with his ex and he gave her his car while he's gone.. she even inbox me on fb asking are we dating because they are too.. so we argued for about two days and I left the situation alone because we weren't going to see eye to eye now everything she has said make me feel some type of way because I help with his kids also he left me the house.. After a couple days went by he called saying block her on everything leave the situation alone because she can make him do more time.. me loving him I'm not going to want him to do more time even tho I know he's no good I still love him I go to every visitation day and court date.. I haven't gave another man time because I kind of still want us to workout but it's like he's playing both of us and the other day I logged into his son computer and went on his social media and  found pictures of him, his dad, and his dad ex with her kids.. Now I'm really feeling some type of way but he keeps telling me don't worry about her I'm good and I have to respect that she's been around longer so they're more attached to her than me so don't let it stress me but that's some bs of you ask me and even though I love him I rather hurt now while it's the beginning than to wait until the end and really be hurt.... and today when I made calls to his mom and sister to come live at the house so I can move out and I took a pregnancy test and it's positive so I'm torn between if I should keep it or not because I can't live like this this isn't the way my life should be going I'm so confused right now I can't stop crying I spoke to him twice today and couldn't tell him because I know he'll want to keep the baby to still deal with me but it'll give him freedom to really f around because we have a child together... I really need help 😭😩