Why would a guy ask me to text him then leave me on seen?

Me and this coworker have been liking each other for like 6 months but we wouldn’t date because I’m married and my husband works at the same place. Yesterday I let him know that I’m divorcing and later he asked to take me out, since he asked me when other people were close and I still haven’t made public that I’m single I got nervous and said I wasn’t sure but I would like to text with him ( so we could talk more privately) he gave me his number and said he was excited for me to text him. When I texted him the next day he was dry, we barely exchanged a very few messages, I didn’t get the chance to tell him I wanted to go out and he ended up leaving me on seen. Should I wait a few days and then text him again? Or just let it go?

Why would a guy ask me to text him then leave me on seen?
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