If you want my honest opinion, I don't think that he really wants you to meet guys full stop - not because of "stretching out" which is ridiculous. Maybe I am being out of line by saying this here, and I apologise if I am, but that is certainly the impression I got from meeting him. It is not a cuckolding relationship if he takes no pleasure from the situation himself. Maybe he puts up with it because he loves you and knows it makes you happy. But that is a very dangerous game to play when both people are not completely honest with each other. If this is the case, then I would hate to think of all the feelings that are going around his head. You need to talk to him directly about it and ask him to tell you how he really feels about your meets.
It all depends on whether you really love him and want to stay with him or whether you would rather have your fun and maybe find someone else who takes genuine pleasure from seeing you with other guys. Only you can really know the answer to that.
I may be completely wrong on this, but whatever you choose, I hope you work things out.
xxx