Yedishazach— I understand saying no to an interested party is hard and like u mentiond can make you feel bad. Natural. Normal. In fact it shows a sensitivity of you to care that the other party may have felt by ur decision.
However, you should realize that its extremely short, people get over it quickly once it settles in their mind that if the date didnt feel its right obviously they’re not the one he or she is meant to marry.
Secondly, understand that whom you marry is a big desicion and one should never move forward because they can’t say no. So you did the right thing, and no need to feel bad.
Isn’t that the purpose of dating?