How do I fix a relationship with someone I’m fighting with?

I have someone I talk to and I keep ruining my relationship with them before it even starts and every time I’m given a chance i blow it i don’t do this on purpose and i just tend to always start arguments I’m always the first to leave on bad terms and it’s only after that i realise my overreaction at the moment we are not talking to each other anymore and I’m seriously losing my head I don’t know what to do please help me
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