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Hmmm, yes, was thinking that too. You sound really open, nice and honest Trills. Nothing wrong with mates of the opposite sex at all.....but it shouldn't make you feel funny and it shouldn't exclude you either. Not saying that you should be in the middle of their friendship.....just that she shouldn't be in the middle of your relationship IYSWIM.
Okay guys, thing that may or may not be significant (of course if DP were off with someone else then it could all be an elaborate ruse ) is that said girl likes girls.
Thanks for the advice Shiney, he's said before that if she were straight it would be different. And he is using your post as a reason why I should have mentioned this at the beginning of the conversation (damn you for making him right!), but I wanted to see how you all saw it first.