My dear it will be important that you have a discussion with your friend around this especially how this makes you feel and further how you want your friendship to be from now onwards. If you don’t want to pay him and he doesn’t agree..you might have to rethink your friendship. Friendships shouldn’t be about material or financial gains. Its better to base your friendship on personal traits. Such as being kind, supportive, respectful towards each. That should be the bases of friendship.