My (f24) toxic bf (m22)dumped me and now wants me back

Any words appreciated

My ex dumped me last month and now that I finally stopped begging for him back and tried to cut him off he’s asking me to come back, I love him, so much more than anything but he is cruel and awful towards me while we were together, I wanna be with him but I know it wouldn’t be good, it’s unhealthy and I’m trying to tell myself maybe I do deserve better, but I invisioned my whole life with him and it’s hard to let go, I have major ONEITIS. I know i should block him and try to move on even though it hurts and I’ll probably think of him til the day I die as the one who got away

I met this guy who is really cool and I think I like him, although I DONT wanna rebound or hurt him so I’m taking things slowly but it feels wrong as if I’m cheating or owe something to my ex. I know this isn’t a healthy coping strategy and didn’t plan to meet someone romantically. I just want to be moved on and healed before I commit or try dating again, but I’m scared it will never happen. It feels like my life is crumbling around me.

Please someone give me advice to not cave in and repeat this cycle over and over again, how do I forget someone who means so much to me, how do I block out the memories and moments and the future I wanted with him. How do I know I won’t regret my decision later on, what if he is the one and I’m letting go? I know it’s for the better but god my heart can hardly take it. Please any advice or words of encouragement I need it now more than ever.