He ain't worth the dirt under your left foot bestieヽ(`Д´)ﾉ
Don't feel ashamed. Sit back, take a deep breath, drink some water, and remind yourself that someone like that is a jerk and you're better off without em. Even if it's embarassing and hurtful today, you'll do much better in the future!
And I recommend release your persona and Nerd Project :)
Yk just ignore him like forever and block him too in everything cuz wasting your time on people like that is just gonna drain you, and he most likely only wanted some "replacement" cuz he hasn't moved on from his ex yet. There are far more better guys out there, just focus on your studies and improving your attatchment issues rn, also you could try listening to asmr that can cheer u up(I watch a lot of Mayawinky's asmrs which r really funny and relaxing for me) anyways here r some of my favorite bls with really good plot https://www.mangago.me/home/mangalist/2243491/?filter=&page=2
100% second this. Focus on yourself! It's be best thing you can do right now. Don't give him more than he's worth by staying attached or hurt from him.
Unrelated but just cried my eyes out for a guy who I had a talking stage (or a situationship) with for 10 days and ghosted me knowing we're in the same class. I feel so ashamed for reaching out to him w an alt thinking he was just sulking and got left on read instead. I feel so cheap like I was so freaking easy to get and that I deluded myself the entire time. He still follow his ex who cheated on him but blocked ME who he's been talking/flirting with until this afternoon. Idk why and I'm so conflicted as to what I should be feeling. Any idea how to deal with this and pls recommend bls to distract myself thank u