Can we chat please, Miss?

I think what you're describing is a sad situation. You and your sister's boyfriend sound like normal, caring people. She sounds horribly insensitive.

You seem to be a real genuine person that cares for others- you felt for him and hence you cried.. I really appreciate you for been so kind and honest.
More power to you, dear lady.♥

Looks like he started his period too.
Sorry but come on.
Dude goes to hang out where he knows his ex is going to be talking to other guys. Given she's a bit of a c for doing that in front of him but I wonder how much of this crying shit she had dealt with so far.

I mean who the fuck do these people think tbey are??!!

Fuck this world and everyone in it!!

You have a tender-heart ,seems your sister doesn't.
I don't always cry, but I feel badly for the hurting and usually anger toward the one acting cruelly.