"Look, I already know we don't have anything in common. Don't bring it up later as a reason to leave."
I don't know you or your context but, without that context, that reads like someone missing the boat completely about relationships. Sure, you might start out without anything in common, but part of the bonding processes is finding things you do have in common (typically by experimenting with each other's interests, or mutual exploration/discovery of new interests/experiences). If you don't nurture that, then over time you may grow apart and no longer have anything in common.
I don't know you or your context but, without that context, that reads like someone missing the boat completely about relationships. Sure, you might start out without anything in common, but part of the bonding processes is finding things you do have in common (typically by experimenting with each other's interests, or mutual exploration/discovery of new interests/experiences). If you don't nurture that, then over time you may grow apart and no longer have anything in common.