I have 2 years with my boyfriend but a few days

I have 2 years with my boyfriend but a few days ago I started having sexual fantasies with a man she barely crossed only with words but I think I turn him or do not want to be unfaithful to my boyfriend but long ago I was not really successful the point of wetting my parts again and again, strange when it happened with my fiance, I should not be with someone out of respect for him and our relationship, I do not want to leave because there are many things together. For most men how to know they are loved is when they cause arousal in your partner and tell my boyfriend that I am successful for another, not the be the end of our relationship and do not want that, do not ... Maybe I have the answer in my hands but not see or do not want to see