No problem, I didn't elaborate earlier in case you weren't interested or already understood.

Boundaries are needed to keep other's business with them. Of course you can move the boundary when needed when you want other's business to affect you but to be healthy it is helpful to keep a boundary up so that you aren't absorbing other's issues. You can't take on everyone's issues, it's just impossible.

So when you mention that you hate to see other's upset or hate to have them angry with you, a boundary could be helpful.