I am a good friend

My brother found a scrap of paper on which I had scribbled an incomplete letter to a friend, to be included in an email. I don't remember the exact scenario which drove me to draft such an email, but to my recollection it was for a friend in a time of need, and I don't believe I ever sent it.

"I'm glad we have a mutual interest, and I hope it will strengthen our relationship. We're good friends and I hope we'll be in eachother's lives forever, so I think it's time we made a pact: if you're still single in ten years call me, and you can watch me banging my partner."