Me and my girlfriend have been dating now for 2.5 years, and there is no way that I can believe that she is cheating on me. She is the love of my life, and I would give anything up for her (I've been with quite a few women and have never felt this way about anyone else). We live in different cities that are 1.5 hours away, and I see her about every weekend (She also has her mother's house that's an hour away in the other direction).
My girlfriends best friend says that she's cheating on me
I called her up on Christmas Eve to say hi, and she answered the phone but was completely hammered; her best friend gets the phone from her and proceeded to tell me that she has been cheating on me for a long time, and that she (the best friend) couldn't stand by and watch. The best friend said that she was cheating on me (commitment issues from her dad cheating on her mom) in both places and gave details that somewhat matched up to things that I know. The best friend says that my girlfriend has said to her that she wants a guy in her home town, and that I am just not "it." I literally can not believe that she could do this to me; she means everything in the world to me, she's the woman that I wanted to marry and have kids with, and as far as I can tell loves me. I need hard substantial evidence for me to believe.
I've devised a plan to have the best friend call me, and then call my girlfriend (three-way call) while my phone is on mute and listen to the conversation for the best friend to try and coax some type of admission of any unfaithfulness. If found unfaithful, I will break up with her immediately, but nothing I say will point back to the best friend.
My question is: What do you guys think of this plan? Can anyone think of anything else that would help prove to me that she is doing this (I've accused her of cheating in the past and have given her windows to tell me the truth, but she won't admit anything).
One more important detail is that after about two hours on the phone with her best friend (she was using her own phone at this point), said afterwards that she wanted what me and my girlfriend had (as far as my side of the relationship) and wanted to come see me a couple of days later. She is the only one that has said anything about my girl cheating on me.
Should I look for other means (other friends) to find out? Or should I go with my original plan of the three-way call?
Thanks in advance.