Does he love me or not?

ok, my man and i have been together 2.5 years. I am almost 18 and hes 23. together we have a 13 mth old baby girl. we fight very regularly and it gets very one sided if you get what i mean. he had with my old friend because i said id rather him have with her than look at . he still looked at which upset me but i got over it and hes 100% faithful, even buying me laptops, tvs, clothes everything he even wants another baby with me. but when we fight he tells me hes only with me for the babys sake and that he doesnt want her to grow up like me and threatens to smash my head in, so far hes only even pulled my hair and called me names. i am scared of him but he seems to love me and it seems very honest. i have no idea what to do, i love him some days but others i am terrified of him. he has a addiction i am sure of it (otherwise it must be normal for guys to sit up at 3am looking at every o site imaginable) we do have quite a lot lately, a few weeks ago it dropped off pretty bad and we had maybe once or twice a fortnight. he has started drinking quite heavily as well. i dont like the fact he watches but what choice do i have? i tried to stop it by allowing him to have with girls who were meant to be my friend but even that didnt tempt him. i am also concerned with the type of he watches, its pretty gross, like 2 girls 1 cup, i watched it and almost threw up my lunch... if he actually expects me to do this like he asked... it will never in a million years happen as i find it almost as revolting as having with a goat.