What should I do moving forward?

Thanks so basically me and my girl have been dating for close to two years I love her I love her family I love the way she cares for me we aren't perfect and have our ups and downs but at the end of the day I love this woman so I had weight loss surgery and this girl messaged me on ig because she saw I did we started talking

I told her upfront that I have a girl one thing led to another and we had phone sex and I feel bad about it. I was going to go see her but I told myself no I love my girl and I feel really bad that I still talk to her and she's saying that she wants to come see me and stuff and thay she wants to be my friend but I told her its not possible because we crossed that line and I just feel horrible for wanting her physically I feel like Chris rock in i think I love my wife (throwback)