If a guy/crush says “I don’t wanna cross a line or anything…” over coffee (he asked for) is he testing what your line is?

Had a previous crush say this same thing early on and that turned into a relationship after he revealed feelings for me, so it seems like it’s maybe a line guys use to gauge your interest/openness

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We text a bit too (after he asked for my phone number, we work together so we can talk professionally on our work chat program too) but when I respond positively to him implying we should get drinks he stops responding. Happens with other of the more obvious flirty stuff I say. But he specifically asked for my number and for coffee. But I get flirty (just subtly, nothing crude) and he stops responding. We work together so I don’t want to make something of nothing.
If a guy/crush says “I don’t wanna cross a line or anything…” over coffee (he asked for) is he testing what your line is?
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