confused

i m in college in my 2ND year..i have been in love (or infatuation) with this guy in my group ..well he is a bit confusing because other times he doesn't show any care but matters related to what i wear how i conduct my self to whom i talk he acts as if hes my boyfriend while other times he doesn't even notice me.
although he had a girlfriend to whom i am still not clear if he is committed to and then in college he spends time with another girl as if she is his girlfriend ... i am confused and fed up of this triangle ..please help