Do you ever stop hating the woman who broke up your marriage?

I've never been through this, so I really don't know.

My friend was cheated on 3 years ago. It ended her 10-year relationship and marriage. She ended up forgiving her husband, but he had fallen in love with the other woman and didn't want to come back.

I don't know how long it takes to overcome something like that, but it seems like since then, all of her choices have been fueled over her hatred of this woman.

Maybe towards the point of obsession? It seems like all her energy is going towards trying to stick it to her. Even the good moments have a message of "Ah-ha!! See how good I'm doing?"

Her social media is filled with things, saying that she will always love him and how she will always care for him and be there for him, even though he's with someone else. She also posts a lot about overcoming cheating and stuff.

The thing is, this has become her entire personality, and she seems to be on this race to who knows where. This competition amongst herself because the other woman seems to just be happily going on about her life, not paying any mind.

Will this ever end? Will she become the person she used to be and not seem to be on a steroids contention for the rest of her life? If this happened to you, did you ever overcome it or is that hatred you always hold on to?