Breakups....should she tell him?

That's so true bluegal she is such a sweet person. I think she also just doesn't want anyone to dislike her.

No - tell her to run for the hills and be thankful he has gone without fuss.

If she contacts, she only opens the doors and the cycle will start again.

She doesn't owe him any explanation and pointing out his flaws is NOT going to help him in other relationships. That is something he has to realise himself (if he wants to)

Tell her it isn't important what he thinks of her! She only has a duty to herself.

Let sleeping dogs lie
What’s she going to achieve by giving the real reason and putting the blame on him, what’s going to happen??? ... he’s a man with a temper .... need I say more
Is she really worried about what will happen in his next relationship or is she a bit peeved that he happily let her take the blame
Keep walking in the direction she’s facing daft if she backtracks