Relationship adive?

I know I shouldn't post this stuff on the Internet but I am so ready to just call this "relationship" quits. I'm 13 weeks pregnant he is constantly out every single night with his friends till 1 in the morning in our garage (so I know he's not cheating but still) I see him maybe one hour if that a night. He's lying and now I found he's been taking Xanax behind my back. I don't know what to do anymore ever since we got pregnant he's been completely different. I love him but I don't like the person he has become. Side note we tried for this baby for months.