Was this guy interested on me or not?

This guy for almost a year, appeared to be very into me. He would always stare at me, be near me, follow me, was do sweet to me, he dressed very y for me, he always needed me to see his clothes or haircut. This happened everyday for a year. So, I asked him out. He told me he was straight. He then became vehemently phobic. I am absolutely shocked and saddened by this. He knew I was gay. Why would a straight guy focus all of his energies on a guy? Why did he do all the things he did. Am I dumb in thinking he is closeted? Straight girls, what's your opinion on this too. Thanks.