Help

So i think i have a situation... and its a very strange one.  A friend of mine(a male), he told me to be ready to break up with my boyfriend because he thinks that he'll cheat on me while hes in college.  He thinks that he will become a partier and will have sexual relations with a whole crap ton of girls.  First... no.  Second... he doesnt drink... and as sad as this sounds he doesn't have any friends (in college.)  My friend Steph tonight when i told her this said... and i quote... "I think he likes you..."  Well the thing is... this friend of mine has said that he's Bisexual...  but then sometimes he says hes gay... I dont really know what he is.  But i don't know if he likes me or not... he wouldnt let me walk on the road and kept saying "its the gentleman thing to do..."  Alriiiight.  I don't even know what to say or think...  I dont feel the same way...  but he doesnt make any sense.  We went like a week without talking and he was super mad at me... then the next minute hes like all nicey nicey... like whaaat.  He's like my step dad...  I just don't get it.