My (24M) lover (28F) left me for her ex

I (24M) met this girl (28F) in an online game a few months back. She had a boyfriend at the time, but they were on a break and stopped talking a week after I met her. She happens to live super close to me and since, we’ve met up in person plenty of times. We hang out pretty much all day & every day. I would be on call or FaceTime with her 20 hours of each day, every single day for the past few months. We’ve slept together a couple of times, and she has met my whole family. I asked her multiple times if she would be with me rather than her current boyfriend & she said yes, but couldn’t break up with him at the moment because he apparently owed her money & wouldn’t break up with him until he paid her back. The reason why she didn’t want to be with him was because of the fact that he didn’t want to get married before. Recently she broke up with him & a few days later, he agreed to get married with her, despite not talking to her for the past 2-3 months. He has a stable career, makes good money, and I’m still trying to get my life together. She has agreed to move out with him instantly, and get married with him. I don’t know what to do. I don’t know how to feel. She still wants to be friends with me, but she means so much more to me than that and it feels like the past few months, I was just a distraction for her. She didn’t think twice about getting back with him, and even accepting his marriage idea. I think the worst part is, she is the only person I’ve really talked to the past few months. I don’t really have any close friends outside of her, which kind of just magnifies the pain because it feels like she’s the only one I have & now she’s gone. I haven’t been sleeping much, as this news is super recent & has been on my mind. I’ve been sleeping alone the past few nights, and this is just so foreign to me because I was always sleeping either next to her, or on call with her. It feels really shitty being alone. What should I do? How should I feel? I am so lost. Do I keep her as a friend? I am desperately in need of advice or suggestions. Thank you, reddit.