How to let go of an unwanted attachment I have with someone?

I have an unhealthy attachment to the guy im with. I know this because I've tolerated things i never would’ve done before i met him. I love him but we bring out the worst in each other. We’re both too attached as well. I've tried breaking up a couple times before but we always end up being back together again. The last time we broke up, i thought was for good, and i felt like i was sick to my stomach for days until i saw him again. I dont want to keep doing this but i just dont know how to make it better. Any advice?

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He also always fights so hard for us to keep the relationship which makes it so much harder. How can i let him go for good?
How to let go of an unwanted attachment I have with someone?
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