She is the new girlfriend of one of his friends and they are texting a lot more than I'm comfortable with. He works nights so we are apart a lot and while he's at work they text back and forth a lot. While I trust him, I feel like an overly friendly woman who says things like "you can tell me things you can't tell your wife" is a threat. I don't want to confront anyone as there isn't anything to confront about but I do want to prevent anything from happening. Do I befriend her (keep your friends close and your enemies closer), avoid her and don't speak to her when we do cross paths? I'm out of my league here.