My girlfriend is a non-stop cheat

Any time we walk into a party or bar she scans the room for potential lovers.

She knows that I hate her flirting but says she can't help it; if she can't be herself then there is no point in living.

That's how she is - but it's not the way I want her to be. I long for her to be faithful and true to me, but trying to control her is like putting a saucepan lid on an erupting volcano.

She's powerful, fiery and strong-willed and I sometimes wonder if I'm in over my head with this relationship.

I can't work out whether she's a genuine sex addict or a cheap cheat. We've been together for 18 testing months and I don't know how much more I can take.