@coolboymew maybe i'm looking too much into it but maybe she's asking "why do men do this" in regards to the girl being 12 years younger than him, as if he is stuck in the past with this old relationship so much that he's dating a girl that was around her age when they first dated.
@ChristiJunior @coolboymew I can see it perhaps being a little weird/sad, kind of like when your ex starts dating someone that looks exactly like you