Pretty sure this is a MLC or Identity Crisis

[sleeper]

...if getting back together with W down the line she may have an STD???

IMHO, You're thinking way ahead of events and yourself and attempting to predict the outcome. (we all did/do)

My X said she would never marry again

She chose a thrill-seeking OM (pilot,skydiver,motor cycle rider, no children) freshly D'd who also said would never marry again

He did give her an STD

They are now married

Let her go as if she'll never return (you obviously haven't). Take care of you and your child.