I have a big crush on this younger man!

I am attracted to this younger man & desperately wanting to get to know him. He showed interest in me, but he knew that I have a steady boyfriend. (I bought clothes for my BF) in the Department stores. How should I let him know that I am very interested to date him without giving out the wrong message as a two timer? Your feed back is greatly appreciated.
I have a big crush on this younger man!
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