Should I break up?

I have been in a relationship for 3 years this guy was amazing literally anything a girl can ask for the second year he started his own company and started making money and he turned out to be nothing like the guy I met at the beginning i tried to adapt my self to the change the third year i caught him teaching on me with several different girls i wanted to breakup but I couldn’t I was still in love with him I forgave him and he proposed I accepted and we we’re happy but now he started to act like the exact same way he did in the past a complete asshole part of me still loves him but the other part is completely convinced that the end to this relationship had come
Should I break up?
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