You dont have to be female or pregnant to
get stretchmarks. My boyfriend has
stretch marks. My brother has
stretchmarks. They start off as red
marks or lines then over the years tend to
fade into a paler colour. I really really
think this has nothing at all to do with
your ex girlfriends nails. It's just
coincidence. When you're digging your
nails into a bloke, the easiest thing to
scratch from that angle is the back and
hips. This is also one of the most common
places for a bloke to get stretchmarks.
It just means you're growing. It doesnt
mean your ex was trying to sabotage you by
putting poison under her nails. Or that
you are allergic to her. Hell, after 6
months, I think the allergy would have
died down....
It's really fine