Why did he say I was the best thing to ever happen to him, then leave me?

We've been together 4 years. We didn't have any problems, nor did we have any recent fights. He has shown me nothing but love the whole time and everyday told me he loved me, on his own. He told me I was the best thing that's ever happened to him. He always wanted me to cuddle to him at night. We were planning a trip in a week. He even told me to email his dad and tell him we were going to meet him. Then he up and left me yesterday, with no warning.

Why did he show me all this love and say all those things if he was going to leave?
Updates:
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He leave things of his here for me to see. He left his cologne here, and I don't know why. I guess so I could see it.
Why did he say I was the best thing to ever happen to him, then leave me?
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