Ive been there and done that more than once myself hamlet.

It isnt just something one worries about after long term relationships eaither, go through a rash of short term ones or a mix between bdsm and vanila ones and you have the same effect, the same questions nagging in your mind.

As Arch mentioned its a fear that often leads one to stay in a relationship or situation that would have been wiser to leave or break off earlier,; however, its also a big contributing factor in rushing into things and not being safe in a new relationship or situation that would have served one well to avoid at all costs.

I know it sure made me throw all caution to the wind one time, and I was just lucky to survive.

The best and safest thing one can do imho is take it easy, breathe and slow down, there is plenty of time to do things better the next time.