I agree that the main the to sort out is the communication between you, the ability to act as a team, and be partners. Of course he won't want to commute weekly form the NW to Kent, but moving is a huge thing and he can't just make a unilateral decision.
For what it's worth, I have a relative in Rye and visit often. I love it for a visit, once we have the car parking sorted, but personally I wouldn't want to live there. Parking is a nightmare. Many, possibly most, of the houses that would be listed and have cobbled streets, have no parking. You have to rent a permanent car parking space (which tend to change hands through locals) on the outskirts and walk to your house with your shopping, etc. but maybe he has found a place with a car parking space: so much the better!
The town is split into 2 distinct areas: On the citadel, the cobbled hill, or on the flat land at the bottom. There is a big social divide. The citadel has many retired and very well to do folk, the bottom of the hill shoes the signs of rural deprivation.
The town is so picturesque, but is very dependent on tourist trade and gets ridiculously busy in summer. The road routes are longs and slow until you get to the dual carriageway and motorway.
Lovely beach and seaside places, and inland rural walks, but it does sound as if there are places which would suit his commute better and could be a better place for you to put down roots.
Is his job secure and ing term? Does he have a probationary period?
Go down and base yourself in the area and search together?
So many different areas to look at and many very eye, and with better transport links, if that is important to you.