I dont think any 1 particular event can make you start trusting again. At least I know for me it would have to be long term relationship with great support from the partner.

I would be scared too if I were you...I would be scared that I would slip into depression, over analyze what "he" thinks of me...over analyze everything.

I think you have been apart for so long and he is going to leave I think you said? And you will be alone again..I just don't see THIS relationship being the one that builds you a new trust foundation.

I do think you should go thou..and just look at it like a FRIEND passing thru town...and you are having a night out..to talk about old memories.

Hope you post back and let me know how it goes..or PM me.
Go with no expectations and you can't be let down.