Am i in the wrong?

Am i wrong for not wanting my boys to see my friend by themselves? We see eachother about once a week and the othsr day he was going to ditch me for her and it really hurts. I like us hanging out together i don't mind his girl friends but this one is mine. And there's a previous attraction he told me about to her. He said its like putting bait in front of an alligator and there's natural urges. Amd she was saying whats wrong w us hanging out by ourselves.