As a writer, I can confirm sometimes the guilt will make you embarrassed and kill the writing mojo. If you've been having other type of difficulties that prevent you writing and the person seems selfish, it can make you resentful. HOWEVER, when someone who appears to be a new person, shows up and comments on every chapter and/or you run into someone you don't know recommending the fic... that awakens the muse even if you've entirely stopped writing about it. It depends on how long it has been without updates.

If it's less than a week, hold back, if it's less than a month then be encouraging but not demanding, if it's over a month, do the thing above lol.