I think you've been through a really challenging time, this year especially.

If you truly feel that it is time to part ways, then it's important that you work on some kind of strategy to let him know that it's over.

If it were me, personally, I'd let him know that if you guys can't even live together, then it will be over, per say. I'd put the ball in his court. If he's not prepared to contemplate the two of you living together as a couple after 8 years then I'd be done too.