Was it a bad idea to start messing around with my co worker?

I started dealing with this guy at work. We work in different departments. We talk, interact, flirt etc but to me it just seems like he likes the attention I give him. It seems as if I make his work day go by faster but he doesn’t seem to genuinely like me. Anytime we talk at work, I have to text him and ask him to come to the break room so that we can talk. I’ll sit side my side with him and he’ll be into his phone, with headphones on, giving me dry responses. His body language just seems as though he’s just not into it. I’ve noticed him flirting with other women. I even seen him run his hand through one female co workers hair. Most of the time, he’ll see me and I’ll see him but If I don’t make the first move, he won’t even speak to me. I have went as far as staying over my break time, my supervisor repeatedly calling me but I stayed in the the break room, laid under him and he still doesn’t seem to genuinely care.

Was it a bad idea to start messing around with my co worker?
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