There is always a change to getting emotionally attached, but to be honest, in the case it's always the person and their actions responsible for it. They let theirselves allow to fall in love, or even take action on it. Ofcourse there are friends who have other motives to stay friends, but most of the time it really is because they care about you and love to hang out with you.
When I had a relation for 2 years I started to make friends with a guy, and he tried to win me over after we knew each other for a while. I thanked him for his interest, but I wasn't interested. Gradually I started to feel more then I should have. I never cheated, but I walked away, told him I needed time to get over the feelings I had for him, whatever they were, as I still loved my boyfriend deeply. I choose to not get involved more then I already was.
As of today we're still great friends and nothing more. I'm not in a relationship with anyone atm, but yea. There's a difference in getting feelings and know when to walk away and getting feelings and keep hanging in them, resulting in it getting beyond control, but still, it's the person their own choice to stop or to continue. If there really is just a friendship the girlfriend should stop being so jealous and insecure. A relation is based on trust, nothing more nothing less.
I know people lost their partner to emotional affairs, but that just means they weren't much into their partner at all since they didn't walk away. That's just how I see it.
I wonder what the girl herself thinks, maybe she IS interested, but maybe they are just really good friends. To be honest I would trust my guy even if he didn't had a sister/ sibling relation with his female friend. Ofcourse if she tends to get more attention then me I will say something about it obviously.
