Does being in a relationship bring out the worst side of you?

I've had three long term relationships and I always feel like I get angry with my exes easily when it's near the second year. I also feel like I want less sex. Does that mean I was in the wrong relationship? I been single couple of months and I feel liberated cause I feel like I am me again. Am I destined not to be in a relationship? When I'm in a relationship, I give it all. 

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