Am i doing the right thing?

im 21 this yr. i dated my ex for 7 yrs. i broke up with him last yr december, because i was heart broken, but i know no matter what happens, i ll always care bout my ex, n will neva stop loving him. but i told myself to never go back to him, that its all in the past. about a month later i started datin my bf now. my bf treats me so well n treats me just as well, even when he knows about my feeling for my ex. but im start to feel horrible and unfair for my bf?n planing to break up with him soon?am i doing the right thing here