Why did he block me for NO reason?

IronMaiden
What happened was I used to date this guy (For privacy's sakes, I will call him Tom), however, when he asked for sexual favors and I refused, we fell apart. I could not believe her was looking for something casual, when he promised a relationship.

One day when I went on Facebook, I saw on one of his friend list this gorgeous young guy, and without thinking, I added him (Let's call him Shane). Shane didn't know me regardless, but he added me quickly. Apparently, he was very good friends with Tom and they are close. However, our conversations got really deep. Despite having 1000 friends, he responded to me often and we talk a lot. I asked him if he dated, he responded he is single, and in turn, he asked me if I was single.

We talked for a few days without Tom knowing, then I asked Shane out. He agreed and when I saw him, he was dressed nicely and he seemed very happy when I saw him. We then went to dinner, he smiles a lot at me, had a lot to talk to with me and had a very open body language. We even extended the "date" to the park and he walked me home. We then exchanged phone numbers.

Later, when I messaged Tom, he was depressed and drinking, he told me. Then later, he blocked me. I still talked to Shane and he congratulated me on my achievements, and he was sorry about not replying. He did not reply after that. I did message him 3 more times, asking if he was ok before I totally ignored him. Two weeks later, I found that Shane blocked me! I am crushed!
Why did he block me for NO reason?
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