How to regain self esteem after being cheated on?

he cheated on me and left me for her.. i chased him.. begged him.. he told me that he loves her... but now i regret all that i stopped contact him.. i was affraid of being lonely so i did stupid things.. i am 30.. i suffer from low self esteem because i let him do that to me.. i lost my self.. how to fix that

How to regain self esteem after being cheated on?
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