I want revenge on my sister's ex boyfriend, is my hatred towards him ok?

I used to advise her against living together with a boyfriend and make him give her his last name but she didn't listen and got carried away by the romance, falling in love stage and a bunch of nonsense.

She got tired of 7 years of their relationship heading nowhere, his broken promises and him still needing time and making excuses on how kids are a major commitment but he'll propose one day soon. Yeah but he sure enjoyed wasting her time. For sex and romance, he's ready like tomorrow but not for the serious things. At the end, he eventually admits that he only wanted a girlfriend but couldn't tell her because he didn't want to lose her. Basically he lied all along about wanting kids and marriage one day. I never liked that man.

She broke up obviously and then found out she was pregnant. Not wanting to be a single mother, she hesitantly aborted the baby and has been damaged and depressed since, cries constantly and at times even drinks heavily. She's pills and is have sessions with a psychiatrist. She's now 29 and lost hope at everything.

My parents and I hate that man. I wish I could get revenge on him. She was a sweet, shy girl who wanted a future and kids like most of us want. And now she's a shell of herself, ruined.

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1 mo
She's deeply traumatized at this moment. Sometimes she has nightmare of the chose she made. She felt as if he gave her no choice.
I want revenge on my sister's ex boyfriend, is my hatred towards him ok?
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