Difficult understanding

I just have a difficulty understanding why people put up with bad shit in relationships. Like, I don't care how much I love someone; if they aren't treating me the way I deserve to be treated, I kick them off. I deserve being treated with trust, respect, and equality and if someone isn't willing to give me ALL of that, I'll find someone who will. So I just have a hard time understanding why anyone would put up with an unhealthy relationship. There's a difference between misunderstandings and plain unhealthy.