Congratulations, you're plus one set of antlers, and minus one friend of 20 years, all over a deer that neither of you shot and a situation that was probably a simple misunderstanding. God knows those antlers are way more important than friends.

As for offering him half your lease, I don't think that's something you have to worry about, because he'd be crazy/stupid to go into such a venture with someone as petty as you appear to be. Enjoy hunting your land... alone.

Mike