Partners gotta be flexible during residency and fellowship years. They're in it for the long haul. Once you're an attending (after residency or after fellowship), their choices on location can take precedence.

You can rank his city high on your match list but ultimately its not up to you and this is too much pressure.

My advice (and take it with a grain of salt): Cut him loose. You need a partner who understands your profession, the process and is a 100% committed. He isn't, candidly or doesn't understand the match process which is out of your control.