I asked him if he is still working and he replied hahah stalker, should I stop reaching out to him?

My coworker and I regularly text on work and random stuff, we are becoming friends and I can feel the romance in our relationship. I feel that we like each other but his comment to me being a stalker even if it was a joke has really put me off. Should I stop reaching out outside of work hours?

I asked him if he is still working and he replied hahah stalker, should I stop reaching out to him?
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