Why won’t he let me go?

Cassie2020
I was in a relationship with my boyfriend for over 3 years, we had a lot of problems all down to him cheating. Anyway he basically never broke up with his ex and was seein her on and off throughout our whole relationship, I finally had enough and left... he came begging... like a fool I took him back to find out he’s still seeing his ex, he even went on holiday with her... I left again I ignored his efforts of trying to get back together and after about 2 months gave in and gave it another go... to then find out he’s still seeing her.. he went away for the week d just 2 weeks after begging for me back. Iv told him numerous times to just leave me alone and go an get on with his life with her (his family and all his pals love her) I’m basically the girl who tries to brake me them up in everyone’s eyes... anyway so he constantly says he does not wanna live without me and when we brake up he always says he knows he’s lost what he wanted meaning me. So why if he can’t be faithful and happy with me.. why doesn’t he leave me to be happy with someone else and go an be happy with her.
Why won’t he let me go?
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