Marriage on the Rocks

Denice
Two years ago when I met my now husband of 5 months, I had made it very clear how I felt about female friends. I made it clear in case we disagreed, we could part ways before it got serious. He went back to school about a year and a half ago and it has been nothing but issues with these female classmates/friends. I have talked to him, fought, cried, tried to compromise, asked nicely etc. to guard his heart and eyes from temptation. He keeps saying he's not cheating, he explained that the girls are just classmates and there's a lot of group work so "everyone gets close." I told him one thing can lead to another and he disagrees. It has gone from talking to class, to exchanging phone numbers, following each other on Instagram, adding each other on Snapchat, having drinks to celebrate the end of the semester, taking pics together and now these girls are contacting him when he's at home and it's summer break! I have met some of them in person and I did not feel they showed me enough respect as his WIFE and he says I overthink things. Please help with any advice or ideas on what to do. I am seriously so heartbroken; it pisses me off that he's making new female friends instead of concentrating on being a better friend to ME. Thank you in advance 💕