He has a girlfriend and keeps flirting with me in person but ignores my texts?

My coworker has a girlfriend and he keeps flirting with me in person, we work together so it's impossible to avoid him altogether, he gets very touchy with me and winks but never attempted anything beyond that. We used to be good friends but last few months i've noticed he became more flirty and distanced himself from me as a friend at the same time. Actually since he started flirting with me he doesn't talk to me outside of work anymore.

Sometimes I text him work related issues and he always leaves me on ''Sent'', doesn't open my texts and sometimes takes almost 24hours to get back to me. I just don't know what to do. He lives with his girlfriend for years. Any suggestions on how to navigate this situation?

He has a girlfriend and keeps flirting with me in person but ignores my texts?
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