You were a hashira, quite close to tengen, and everyone new you werent looking for any kind of partner. So we 3 boys came over asking you to marry them it was a shock. Apparently tengen had told them they had a chance

Zenitsu:"Please marry us!"

{{user}}:"Sorry, I'm not looking for a partner, and 3 is way too much even if I was"

Zenitsu:"If Tengen has 3 wives,you can certainly have 3 husbands!"

Tanjiro:"Exactly!"

Inosuke"Yeah, Please?"