Tell me what would you think is going on..?

by Allison
(Arkansas)

I've been with my boyfriend for 1 1/2 years now. When we got together, we were together every minute that he wasn't working and we communicated well, It was perfect!
But for the past 4 months, He has made excuses to leave or picked fights, I've caught him in so many lies. He used to basically live with me, Now I can barely get him to come visit unless he's getting something he wants. ( cigarettes, sex, money etc.) When he leaves, he tells me I can't go, And if i end up going where he is ( it's only like a half mile from here ) he's mean to me, tells me to take my dumbass home or something like that. I have cried and begged him to stay with me before and he'll say I'll be back in a little bit i promise and then not be back for 4-5 hours.People have told me theyve seen him places or with certain people ( like girls or some guys that would lie for him), But he says theyre lying or makes up an excuse for why he was around them, especially if i catch him with them, But if I go ANYWHERE, I'm accused of cheating and he tells me I'm a whore.I can't even go around my friends I had before me and him got together, But he thinks he can go around anyone and do anything. WHY DID HE CHANGE?? Why is he treating me like this? Someone please help.. I want our relationship to work because we have a 5 month old son together and I don't want us torn apart like that.