He said if we weren't together eh wouldn't date anyone ese, is that normal?

Whenever my boyfriend and I have talked about not being together in the future (for whatever circumstances; death, break up, etc) he always says he would never date or sleep with anyone else again. Is that odd?
It always makes me feel really weird and somewhat guilty because I've had more partners than he has and I know that I would probably move on and eventually find someone.

So is it weird that I wouldn't be afraid of going out and pursuing others or is it weird that he feels like he would stay forever alone?
He said if we weren't together eh wouldn't date anyone ese, is that normal?
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