What should I do...

Hey.. I'm a btech 1st year student from xyz college And this is happening with me from the very begning of my college days..... There's a girl in my college we are not dating we are just friends and I'm OK with that but the problem is our friendship is not just friendship now like from the very begning we have started se*ting I think from the second week we got way too far.... And after that since 3 to 4 months we are getting physical(kissing,touching......) inside the class...... Is she asking me to do that? Absolutely No... Am I asking her to do that? No.... We both have decided 2 to 3 times that we should stop doing that but at the end we end up doing the same thing again and again..... Amd one thing too from the start she's been telling me about her past traumas like we usually talk on these 2 topics either se*ting or I'll listen to her traumas and it's not like I'm the only one she's telling her traumas she's sharing it with all her friends (like she shares with all our mutual female friends )and they too think that her story is a complete like not complete but yk most of it.... And..... yeh I think that's all.... hope someone who more experienced will guide me... Thank you.....