Please respond I really need help. DESPERATELY

So I’m hung up on my ex. I miss him so much, but I don’t know if he has moved on. He keeps glancing at me during class... and we’ve made accidental eye contact multiple times. I try to avoid him just Incase I grow more feelings. Keep in mind we only dated for a day because he wasn’t ready for a relationship. I’m dating someone and I hate myself because I like him. And I shouldn’t. I wanna cry. I don’t deserve to be loved because I always do this to myself and others. I love my boyfriend, but I’m starting to love my ex. And my boyfriend hates my ex with a passion. I don’t want to hurt my baby. But I wanna follow my heart to my crush. I know he might not like me back and I’m totally fine with that. I deserve all the pain in the world for this. Apart of me wants my man to break up with me so I don’t Hurt him. What should I do? Any advice?