I can't get over my feelings or my girlfriends best friend who was also in a long-term relationship.
What made you fall in love with her?
Because she is absolutely gorgeous and she has a nice personality.
You shouldn't cheat on you partner. If you lack love for her, then break things off.
I'm going to steal her so, it's only fair.
You shouldn't do this, you're going to cause a lot of problems by doing this. Not only are you gonna ruin your own relationship we are also going to ruin her friends relationship. This will and poorly for you, take some time to think about it.