What I learned growing up with someone in the household who can be excruciatingly difficult:
The amount of love someone has for you doesn't influence how they treat you or if they do terrible, hurtful things. They can still love you deeply and yet, in their damaged way, act incorrigibly.
The good thing about realizing this is how much less power it has. Because it's so easy to think "I must be a horrid person to deserve such treatment" -- especially when you know they're capable of such goodness too.
But pain makes people do dreadful things and, well, sometimes you're just in the crossfire.