Three people, two coasts and a smoking Twitter gun

From a reader:

“A couple of years ago, I started a casual sexual relationship with a person who had been a friend for years. I thought a big reason it was casual was because we ended up living on different coasts; we always seemed to have genuine affection for each other as friends.

“For about nine months, we communicated (text, e-mail, phone) several times a day, with a few real-life visits in between. Much of it was very passionate, but we also talked about the mundane things in our lives and had deeper conversations that friends have.

“Then this past December, for the first time, I told him I needed something more. We talked about meeting up and going away together. A few weeks later, he suddenly fell off the face of the earth.

“After six months of silence, I had a sudden pang of worry. I Googled him to see what happened to him. I found his Twitter link.

Apparently he had been seeing someone the entire two years we had been sleeping together. Just before his last visit in November, he had gotten engaged.

“My first inclination was to call Fake Boyfriend out directly and let him know. But now I am seriously considering communicating with the fiancee, to let her know we had unprotected sex while they were together. If I were in her shoes, I think I’d rather know the truth.”

I’ll ask you what she asked me: “What’s your take on this?”

- Carolyn Hax