I'm a 25M and lived my first breakup. This girl, who's more advanced in life than me broke things off when the quarantine started with a full 180 spin. In a matter of weeks after being hired to her new job she has already met and gone intimate with another guy. I knew that it was probably about her meeting someone with more independence and status but damn, these videos about The Rational Male from Rollo Tomassi or hypergamous behaviour fuck me up.
I made every single fucking mistake in that relationship, I'm filled with regrets man. I've grown up with a single mom and it surely didn't help to not have a father figure to teach me these things. What's odd is that the girl i was with wasn't the prettiest, at times I even asked myself why I was with her since I could definately do better. Not only in terms of beauty but in terms of intelligence and connection.

Still, I feel hurt. I've been replaced and it hurts the ego. I've been working on bettering myself and building financial independence but I feel lost. I feel like I don't know what I'm doing. I want results fast and I'm not getting my nutrition degree before 5 more years, which I intend to use to grow in various fields of influence. Right now I have no diploma, nothing. I feel like a fucking loser.

EDIT: I want to thank everyone for the great responses. It actuly helped me relax about it a little bit. What fucks with my head is the fact that I'm still living in my mom's basement and have no financial independence yet. I'm starting this degree next year and I'll be about 32 when I'm done, I really can't wait to build my nutrition business. I have communications skills and want to give youtube a go but the results seem so far away. I'm beating myself over not being far when I haven't put in the work. I also work out and read alot, it keeps me on track. I'm also doing nofap. Cheers guys.

EDIT #2: Super thankful to all of you. I'm on the grind now.