You are right to feel the way you do. That is completely normal and how it feels to be attached. I know it sucks. It is a difficult position to be in.

Generally that is how it feels when you have a connection to someone. I have issues with connections because I don't like that feeling either. Mine stems from past abuse and making it hard for me to connect.

It is nice of you to wish your friend well, and it is normal to feel slightly hurt that she now has someone else. My only advice to you is continue to be her friend. If this doesn't work out with the new person maybe she will lean on you and you can develop a relationship with her. Worst case senerio you have stepped out of your comfort zone and made a new friend and that is a step in the right direction.