how much trust...........

[painrush]

...should you have in a relationship? and if you lose any, how far do you go before its too late?

well it depends a little on your definition of trust and how you feel about untrustworthy behaviour.

I think it is different for each couple
some seem to be able to carry on despite massive repeated breaches
others split up at the first sign

as much as you need so you are not left doubting imo

i think you need enough to feel confident and stable in your relationship.

loss of trust and what to do after is individual, imo.