That's what friends are for (closed to George - And ANNIE! [arrival!])
Really, Mitchell wasn't that surprised that Hermione had a boyfriend. She was Hermione (and didn't she marry Ron? He couldn't remember). But after exchanging messages, he headed to the Black Sheep, he ordered shots and beer, settling into a booth. Poor George. He had shite luck with women (except Nina of course. Whom Mitchell wouldn't bring up).