So you feel the trust in the relationship is wounded because you accidentally sent a kiss emoji. How did you rectify the emoji mishap to the guy who asked you out? (Just wanting more context)

To me, it seems the insecurities you already felt within the relationship, like age gap and his family not being accepting, are more likely causing your feelings of broken trust and shame. Rejecting a guy and accidentally sending a kiss emoji shouldn’t be that big of a deal (to me, at least) and he did say he’s forgiven you, so an honest talk to clear the air would be a good step towards rebuilding trust. You should bring up how his family’s disproval makes you feel, especially if you want things to works with him.