I sent an emo, talking about which loneliness broke my heart and how to answer humorously.

You can reply like this: it's too cold at the top, so I've always been a lonely person. I didn't find my Mr. Right until you appeared, which made me feel really lonely. If you are willing to stay with me, I won't be that lonely person anymore. Would you like to stay with me?

This kind of reply is humorous and interesting, and will not make people feel embarrassed. On the contrary, like a joke, even if you don't agree, it won't make both sides unhappy.