Bipolar affecting actions ?

he tells people that he likes me but if i bring it up he gets cold and avoids me. like today for example. i was watching him bowl. he's in a league and when i leave i walk with him thinking its ok since when i asked him if he wanted me to watch him he said sure. anyway afterwards, i walk with him out the door and then out of no where another guy he knew and i knew comes up and they walk away and i walk with them and say i will walk with you guys to my bus stop since i catch the bus. and i catch a different stop than him. and he says to the other guy lets cut thro the bushes, so i just walked away and was upset and i am still very upset because i have loved him years even when i couldnt be friends with him because of his moods.i dont think he is on his meds, because he had really bad b.o. and he was acting like he wasnt on them. because the guy i know wouldnt act that hurtful.he has told me he's bipolar and it seemed as soon as he told me he changed. sometimes he would be ok but other times he would be a jerk.