Hes obviously confused... now i am too...mixed feelings and guilt...?

my 16 yr old bf and i broke up about 6 mths ago but i nvr really let him go.he got a new gf and i think she is good 4 him but...on halloween he had a party that i went 2 and his gf wasnt there. we were playin video games(:D) with some other ppl when everyone else slowly went away 2 get sumting 2 eat but neither of us were hungry. we played for a lil longer(i beat his a$$ BTW) then we started talking and somehow we ended up in his bros rm. NO we didn't do ThAt. but there was some pretty heavy making out going on on that bed and his shirt was off. im so confused! i still like him and apparently he must still like me but what about his gf? he likes her 2 and i kno its possible 2 like more than 1 prsn.