Walkaway Joe
A guy who dates for the comfort of himself (unbeknownst to his dating partner) and when the going gets tough or he loses interest, he walks away from the relationship. ( Think physical ghosting) Long used term from the 1960's,70's and 80' mothers of daughters warning them about who they should and shouldn't date. There's even a country song about it by Trisha Yearwood.
Bobby just left you?? Wow. Well honey, he's just a Walkaway Joe...forget about him.