Hi History_Lover, you are new here I think, so welcome.

The problem you describe is probably not as straightforward as it might seem. I've not been in the same situation, on either side, but years ago, I knew someone who had been very hurt by a girl and for about a year after, he seemed to make it almost a crusade to return the hurt to as many girls as he could. Eventually he lost all of his friends and moved away; I've no idea what hapened to him.

So that's one possibilty, the person you are talk about has been hurt and now they are just seeking revenge.

The other, somewhat nastier scenario, is that this person just gets a kick, or some sort of feeling of power and control, out of building up a relationship just to dash it down again.

Others may have additional ideas but those are the two most likely, I think.

Either way, I would have nothing more to do with someone who treated me like that.

Take care.