I think you are right about him enjoying attention, he use to be a male stripper for 12 years (way before we met, he's 13 years older than I am) and I know he enjoys attention although he has no desire for others. I think in his being outgoing and flirting, he is very naive and can't see when others are trying to be sneaky and have hidden agendas.
Thanks

to all of you who have responded, you have all been helpful and have made me realize that it's not me with an issue, it's the other woman.