Since our threesome sex with my girlfriend has been a disaster

DEAR DEIDRE: Sex with my girlfriend has been a disaster since I had a night of passion with her and my schoolmate.

My biggest fantasy had always been to have a threesome.

We are both 31.

We were in bed talking about sex and what we’d like to do to spice things up one afternoon and I shared my sex dream.

She laughed out loud but said, “I’d be up for that”.

I couldn’t believe my luck.

She then started talking about hooking up with another...