before knowing my ex-gf I was of the mentality that i dont need a girl to be happy and that was true. And then I meeted her and i wasnt very attracted to her but we had good time together while she liked me a lot. So I decided to give a shot and asked her to be my grilfriend. Slowly my feelings for were born and i was becoming a better boyfriend everyday. Then suddenly i was all in love with her. I got oneitis and thought of her as an unicorn, a girl so different to all the other ones . BUUUT, 3 weeks ago she told me that what if we become best friends after our relationship ended with the excuse that we both needed to grow up and mature. She asked me if i would undertsand her if we finish our relationship in 3 months or in a week. I was shocked since i didnt did anything bad to her. Then, the following 2 weeks she started to behave different with me. She was kinda ignoring me and it that time i realized that she was messaging a lot with her gym instructor and she smiled when she texted back and forth. So one Monday i tried to talk with her to end the relationship because the silent treatment she was giving to me was causing a lot of anxiety on me, but she told me that day she wasnt available. Next day was the same story, she wasnt available. Next day the same, but icouldnt resist anymore so i when to her house late at night to talk with her. So we talked a lot and came to the conclusion that we will gave time (1 month) and then comeback. After that, we layed on her living room couch and she sleeped. My gut told me that there was more, so I took her phone and i checked her conversations with her gym instructor. I found that one day earlier she wanted to go to his house. Then a day earlier she told him that she forgot an earring in his house. I was sweating and scared so i scrolled down more and then i found a question that she made him "did u cum outside or inside" and he replied with voice message "all outside. if u are scared take the pill". I was shocked. I never thought this girl would do anything like that. I was desttroyed. I left her house and she is begging me to forgive her. I try to reply her messages the least i can. She said that she thought that we werent in a relationship anymore so she dsaid that didnt feel that she betrayed me. She says she love me and she is so embarrased about her and she says she inst worth anymore.

What should I do? Did this relationship made me a beta?