I want have sex with my exs bestfriend

So I had a crush on my exs bestfriend when I was a sophomore in high school (way before me and my ex got togther) now I am a junior in college . I didn't really like him as a person when my ex and I were together but when we broke up bc he cheated he really helped me and was there for me ,and no I don't want have sex with bc he was the only one there for me bc some many people started hitting me up once they found out even 2 of his other good friends so I know it's not out of revenge bc if I wanted to I could of had sex with both of them . I always have dreams of having sex with him and like we vibe really well together . Is it bad that I feel this way