to reveal the absolute truth or not?

[ILikeStuff]

No, it's not worth it, what's done is done and talking to your SO about past flings and what not will only hurt your SO and cause unneeded stress on your relationship.

 

[Vic]

Tell only that which is relevant. With 2 adults, I think it's a given that they had past relationships that didn't work out. If you want your relationship to work, make it a fresh start. Telling all could lead to judgement about past mistakes that you have learned from and would be unlikely to do again.