How to talk to my boyfriend about?

I'm pregnant and he has been at his friend's house for the past two days. I messaged him on facebook and he didn't message me back. Then I seen that he's been adding girls on his page which makes me feel really crappy. I mean I messaged him angrily telling him that he shouldn't be doing that. I know I can't control what he does, but it's the fact he hasn't grown up yet. I mean he has four months until our baby is born. He doesn't understand how much right now I really need him. This makes me rethink everything I am more than likely keeping the baby. If he's not around I know I can't do this by myself. So then in that case I'll be putting my baby up for adoption. How do I talk to him about us hanging out more? I mean at least include me when he hangs out with his guy friends. It just makes me feel really upset that he's not including and hasn't been doing too much. He had a job which was seasonal, but now he doesn't and he needs to get his to looking. I just don't want to sound like a "*****". It's just I know my baby deserves the best and nothing less. How do I let him know what's going on being ertive but not being mean? Please Help