Why would he unfriend me on Facebook, 4 days after we broke up?

rejected_fred
My boyfriend broke up with me randomly 4 days ago, after what seemed to be a good relationship. Now maybe he wasn't happy in the relationship, fine. And I was getting over him just fine. But today, I went onto my fb profile page and saw a birthday post from my ex. When I put my cursor over his name, it said "add friend". When you're friends with someone on fb, it doesn't say "add friend". When he broke up with me he said that he wanted to stay friends and said that I could call him if I needed someone to talk to. I wasn't about to talk to him any time soon as I needed to get past the break-up. But why would he unfriend me on fb? Especially when neither of us barely go on fb? Also, I'm pretty sure that he still has his former girlfriend on fb, who cheated on him with his best friend 3 years ago. Why would he delete me, but not her?
Why would he unfriend me on Facebook, 4 days after we broke up?
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