Ryanparrish,
Ummm - you have to take more control, if you can. You said he didn't buy the gear that you suggested, ok, but why DID you take two tents including a really heavy one? Cotton isn't that heavy, its bad for other reasons, both of you had WAY too much gear. You aren't even approaching lightweight yet. You owe it to your friend and yourself to look more closely at your needs for the next trip. Set weight limits. Share, but don't take 100 pounds...
Jim