LW#1 does need to think long and hard before retaliating against her ex-fiance. He sounds like he's capable of strking back in ways that she hasn't even thought about.

She needs to be all kinds of grateful that she didn't marry this incredibly nasty jerk and make babies with him. Also, next time she should actually get to know the man she's involved with.

Notice that HE dumped HER, not the other way around. So she was willing to marry a man who belittled her and her father because they were grieving!?!? Sounds like she's got a thing for jerks and needs professional help to find out how to overcome that desire for mistreatment.