<human>: Summarize the given text in a few sentences.

My BF (John) and I have what I consider to be a really good relationship. We communicate well, have sex regularly and just have fun together. We've recently been talking about wedding rings. 

Anyway, John meets this girl recently (22F?) through a retreat he went on and is really into her. Before this, he's had female friends but they were always my friends too. It's clear he has a connection with this girl and says he considers her a really good friend because he feels like she understands him and his sense of humor really well, even though they've only known each other for about three weeks (keep in mind, the getaway had a lot of team building exercises). From what I've gathered, however, he seems to feel more strongly about her than she does him. He initiates most text conversations and for about a week straight, asked her to hang out almost every day. She's usually too busy, but on the rare occasions he has hung out with her, he's honest about it as far as I know.  

I feel very uncomfortable about this intense connection he seemingly has with her and his desire to see her so often, and I've told him this several times. I just feel like we're at impasse here, because what defines *too close* for a friend of the opposite gender? I don't want to, nor am I at liberty to, limit the amount he texts her or tries to hang out with her. In his eyes, he's trying to pursue a friendship with a girl that he feels like he gets along well with. In my eyes, I think it's a little inappropriate to be that thirsty about a member of the opposite sex. But I feel like there is no right answer here and I really don't want to be too controlling. Are limits fair to ask him to follow? If so, what would they even be?
<bot>: BF loves a new girl he met, I'm feeling a little uncomfortable but we're at an impasse because he's not technically doing anything wrong.