I think you should take the right decesion that will make all of you 3 happy and satisfied.Will you truely be happy with soemone with whom you are not honest with your feeling.This will be a burden on your heart by never saying how your felt and it would be like you cheating on his feelings.
You should let your current boyfreind how you feel exactly.You got this responsibilty towards the elation you have with him.Then see what he got to say about it.if he agrees and decide to part ways with you then you can start over with your ex.
Karlene's advice is a great one.Pay heed to it.
Huggs and love to you,
dhav
