When love is plentiful and both of the potential partners who are sought after are willing and available, why compete? Hopefully, it's not like the Highlander movies where "there can be only one."
Newtoday, while I really don't like the idea of comparing either, are there other reasons that your significant other could find you to be unique and special? Are their other qualities you and he could focus on? Even in bed, lovers are unique. Perhaps you both enjoying biking and his wife does not. Broadening the ways you see and share your love could help.