Originally Posted by mestalla guy
I can't quite put my finger on why they aren't good friends by now, like I've said they have different interests, and just have different personalities. I have tried to include my gf more but they both don't seem comfortable when the other is around. My friend went a bit funny with me when I first met my gf, but that was probably down to the fact that we spent less time hanging out, a guy would react in the same way if his friend suddenly became less available.
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this may have already been said as I haven't read through the whole threat yet but I just HAVE to say something regarding the part I bolded.
You cannot be so dense as to honestly think it's because you were hanging out with her less. If she did in fact "go a bit funny" it's because she wants to be your girlfriend, and instead you ignored her and went to someone else, and yes she will be jealous if you hang out with her less because she thinks you should be with her and NOT your current g/f.
Based on everything you've said so far, this friend of yours wants to be more than just friends with you, and you either have noticed or have blown it off.
Women can be placed in the friendzone too, and it seems this is what happened.