Lush
Mods' Pet
Would you be happy if your current girlfriend still had her ex hanging around? Would you be happy to hear her chatting away to him on the phone? If she said - "oh I'm just meeting X for a drink after work." would that be absolutely fine? Even if you trust her implicitly and know there's no way that anything physical is going to happen, personally I always think it's best for your current relationship if you move on properly.