Pregnant and boyfriend never sees me

I’m 16 and I’ve been with my boyfriend for 2 years. I’m also 35 weeks pregnant with his kid and he never comes to see me. The last time I saw him was at our baby shower on August 5th. He didn’t even talk to me then and it’s not like he doesn’t have a way to see me. He has a car and he’s always out with his friends while I’m stuck at home. He recently lied to me about where he was. He told me he had to go and help his dad, but my sister saw him out with his friends. I just feel lonely and I don’t know what to do. I feel like I’m being selfish, but he sees his friends every day. When I ask him to come over or sleep over he says he’s busy. I’m starting to think that he’s cheating, but I really don’t wanna have that mindset. Please help?