Is it normal i've liked the same guy for two years?

I've had feelings for the same guy for two years now. I knew I liked him the first time we texted and the more we get to know each other the more I fall for him. This is the longest time I've had feelings for someone, plus I didn't really love my old crushes unselfishly or unconditionally. It's different this time. And if this matters, he's a long distance friend. But love knows no distance. Anyway I realise this could be bad, because if he loved someone else it'd kill me emotionally, although I'd accept it if she made him happy. So is this normal?