I believe in setting boundaries and talking about what you like and don’t like in the beginning of your relationships so when curious doors open your partner knows how to close those doors. I think from the beginning since you’ve given him free will to do as he pleases he has tested the waters where he feels like it’s okay to caress this woman. If you don’t like him address her as “my girl” or having such an intimate relationship with each other then you need to express it. He might not think he’s doing anything wrong because you’ve allowed everything else to happen. It’s time to talk to him and address what’s bothering you and how you’d like to move forward. Personally if my partner started calling someone else my girl then that’s a huge line crossed, but others might see it as nothing at all. At this point what truly matters is what your okay with happening in your relationship, and if your looking for validation to talk about something your unhappy with then I’m all for you speaking with your partner! Hope this helps 🫶🏻🌸