How to get over someone?

What NG methods would you use to get over someone that you dated? My own experiences on this are that if I do sats succesfully (and actually feel like I'm over him, I've forgiven him and don't miss him anymore) I feel super happy for a few weeks and only have positive thoughts about the whole situation (because all of the regret is gone). Then I start to feel too good about him and start wanting him back into my life (because I remember his good sides and think that I can live with his bad sides/change him). Then I try to attract him back, but after a while I start to think about all of the bad things that happened between us and I decide to try to forget him again.

This is a cycle that just repeats itself. I've blocked him, I've dated other people, and I really think that we wouldn't even be that good of a match. I usually never get attached like this, and after other breakups I have been sad for a while (of course), but I've never wanted to get back together with anyone. So this is very confusing for me.

It gets especially confusing with everyone is you pushed out - Do you ever feel like it would be just easy to change the parts that you don't like about the person you dated? Because you already know how wonderful they can be and you already have feelings for them. Like you could change someone into this perfect person and live happily ever after haha.