Wut do i do??

how do i tell this guy i really really like him? i mean i got a bf but idk who i like more or who is better for me!! the guy in datin now is very similar to the other guy i like. the guy i like, we have dated before (4 times) and i mean we have a strong relationship and then idk i think he might be afraid of commitment or something but idk wut to do plz help!!!