Temp downgrade

A woman who is only with a man because his real girlfriend is temporarily gone. Sje thinks that she is actually the new girlfriend despite him constantly trying to get back with his love. The downgrade is often named Becky and she is clueless.

He’s not crazy about you, Becky; he’s just glad to get laid until his girlfriend comes
back so he is settling for a temp downgrade. Stop being such a Becky and get your own man!