Why did he act so into me and just go MIA?

roaming
I was seeing a guy for a few months. He acted really into me told me he had deep feelings for me though he lived 3.5 hours away we got together on weekends always had a blast, sex was great, he told all his friends and family about me. Anyway, last I saw him was three weeks ago I went and stayed with him. Everything was great. He had to work the following weekend so we couldn't see each other but planned on coming to see me the next weekend. Well, no call no text email or show! I have text a couple times, left three messages and threw a couple emails in there to. Nothing! What gives? I swear he almost told me he loved me the last time I was with him?
Why did he act so into me and just go MIA?
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