Nils, I was almost 40 before I learned to make these kinda decisons with my large head instada the lil one.
Item: She's coming, yer already in the pot with the soup bone. If yah think yer nervous now, wait till she turns the fire on... then the leftovers; & oh lordy; the cleanup after...!!
Item: There's 'something' going on between yah already, doin' the wild naked monkey dance ain't everything a relationship is based on... but it's the ONE thing that 'the other' will never forgive yah for.
Item: While YOU don't know for sure what's gonna happen when your long lost love shows up, SHE certainly does.
Item: Consider (briefly) what your current significant other's reaction will be should she find out.. do you want to do that? AND do you want to endure the aftermath?
Item: She WILL find out. That's a certainty.. no matter how clever you think you are, in matters of this kind, they are 'smarter'. She'll know. Sooner or later; the price will be paid.
Lastly; what's gonna happen WILL happen. The roads been paved to your door; already you are NOT driving the bus. Do you enjoy handing over control of your happiness to the whims of another?
Nils, my pirate friend; in situations like this, the screwing yah get is never worth the humping yah got.
(Unless she's a 10, in all areas!)
Good luck buddy.. hope it *ahem* comes out ok!