<human>: Can you succinctly summarize the text in 1-3 sentences?

Hey, normally I'm all for friends of either gender, and our home is a hangout spot. He, however, doesn't have any female friends except one that he consistently hangs out with, so it seems extremely unbalanced when our friends get together
. 
The most recent "friend" he made out of a female coworker was another 17 year old that he ended up cheating on me with, broke up with me and dated her for a month. Whole separate issue there but we're working through it and I *almost* trust him again (happened last march). He still works there, and this girl he wants to have over is one he was talking to at the same time, often but innocently. Just makes me uncomfortable. 

Is it fair for me to say no? I don't want to control his friends or anything and he seemed so upfront about asking first and accepted my initial "no" gracefully. But... Should I tell him it's okay? I know I'll be on defensive edge but it doesn't feel fair to him otherwise. I don't know...
<bot>: Fiancé called asking if it was cool to invite a teenage girl over under the same circumstances as the one he cheated on me with. I feel bad because it's not her and I don't want to control his friendships.