Welcome back, @chbartist
Good luck with your single and the tours as speaker.
Burning bridges suck, especially when we do it out of carelessness. Sometimes it is just a matter of making a call or sending a message or email to refresh relationships and we postpone it until the next chance and next thing you know you have not contacted that bridge in ages and then you feel embarrassed you'd do it to ask for a favor, so you'd rather not and there you are a bridge burnt!
In my town people had a nasty saying to illustrate the fact that we need people more than we think or want to admit (and therefore should make sure we have help available when needed):
Your ass doesn't shit only once.