I could have sworn...?

my fella was flirting with his mates fiancee' at a recent party. he flirts with everyone in front of me. i have cheated on him in the past so i can't really sa anything here. but her guy was getting pissed with my man, and we were never invited back although the 2 guys are still in contact. now my man keeps asking me about this girl )natasha) is she ic contact with me? how does her and her man really get on? and why don't i hang out with her more, if her fella approves or not?...why wud my guy keep asking about her? why has he only started getting interested in anyone who shows him any attention in past 6 months...