Ellie /kml had some suggestions on how to be coy/mysterious to give the impression to her H that other people (female and male "friends") would like her dispite what her H thought of her at the time.
About your H saying he does not know if he can be faithful, you might say you can wait for for a while and that he is your first and best choice, but asking him if he is suggesting you find someone, using your curious, questioning voice. This should not look or sound like a " do this by X or I will move on" thing.
Imply you only want one guy in the end and will work for a good R, but you don't wait more than X years for someone to make up their mind. Only do this if you think the R is solid enough.
