Well where to start....

There's this guy who I know had liked me before,he asked me to homecoming (but couldn't go even after the fact I had said yes)he gave me hints and we even exchanged phone numbers but the thing is was that when all this happened I was technically with someone else (we were together for before hand but we had broke up in august and got back to together the monday after homecoming...)but towards the end of the relationship I had started to develop feelings for this other guy.I feel bad because we kinda both waited too long and I think he's starting to not be as into me as before,and for the fact we are now on Christmas break so it's hard to really have the courage to talk to him even through text.The other thing about this is that I had a friend who was with him before and she said that when they were together that he'd ignore her when they we're together....I don't really know if I should confess to him or not...and if so, how?