Am i wrong??

Good morning. 
​Well my situation is kinda bad, i have a partner we've been living together for 4 yrs now. He has made so many things to me, the most recent was when i was pregnant with my now 18months daughter, 
he cheated on me and to make a story short it was a b**** i knew because we were friends in the past. 
​But since that happened he promise that he would never do nothing to hurt me again. We stayed together, but i can forgive or forget what he put me through at that time.. 
​Now he has a friend that i really like And i know he feels the same. 
​I think karma will get involved soon!! 
​Am i doing the wrong or right decision?