She[20f] lost her virginity while we were taking a break

Edit: Hey guys, here is an update: https://www.reddit.com/r/relationship_advice/comments/ax601h/update_she20f_lost_her_virginity_while_we_were/

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Throwaway, first time poster, English not first language, tldr at the end, blabla... I am 21

We've been together for 4 years. At the beginning, like all teenagers do, we also fooled around, she was genuinely turned on and wanted to do stuff but we never got to penetration. We were both virgin and to her, virginity was always the best thing she can give me, it's "the only thing she can give only to me in the whole life" and to be honest, that's why I[21m] didn't push for it at all and wanted the take her pace.

Around 2-2.5 years ago, things started to cool down. She no longer wanted to do it(referring to touching and oral) as often and a year ago she started pushing away even though I would ask twice a month when I was sexually frustrated. I really loved her, and I still do, and I think she is smart, intelligent and beautiful and that's why that wasn't a deal breaker for me.

Two weeks after our 4 years mark, she said she felt trapped and that she wanted to take a little break from our relationship. I was crushed because I didn't see this coming at all. Her "trapped" definition was that she felt bad going to concerts and doing stuff without inviting me, and to be honest, I always encouraged her to go with her girlfriends and have fun, I have a feeling she trapped herself? I think she just wanted to take a break and couldn't come up with a better reason or the real reason was offending to me or she just lost attraction although she denied it. We talked it through and we decided that we will take a break and she will call me once the break is over. She was supposed to move in with me in may.

It took a toll on me, I performed bad at my work and I was distant from my family, I was crushed and I hoped she would come back and that we would cry together, agree it was a mistake and move on.

Well, after around 3 weeks, she messaged me and said she wanted to talk. I was so excited and I invited her to my house. When she arrived, shortly after, she basically broke down crying, saying she met a guy[23m] 2 weeks ago and that after 3 days they slept together. She said she tried to connect with him but it wasn't nearly as fun as with me and that she wasn't sure why she wanted to take a break from me in the first place. Now, I consider myself 7-8/10, I am tall and work out semi-regularly. She assured me that it wasn't my looks. She said she wanted us to be together again and that she would do anything to earn back my trust and make me happy. The guy she slept with was 10/10 and a lot of muscle, although I didn't know him or anything about him.

This happened yesterday. I am broken. I couldn't come up with words and just said it's gonna be okay and later politely asked her to leave so I have time and space to think. I can't help it but feel like a backup plan, she sacrificed our 4 years together and basically made me a fool for waiting for sex and thinking that I am something special for her. It bothers me so much that she was ready to fuck some guy, less than a week after we broke up. Even if we get back together, am I supposed to have sex with her now or what...

I will provide more information if needed, but I am really struggling for some advice on what to do.

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TL;DR: Girlfriend wanted a break and during the break she lost her v-card. Now she wants to get back together.