Am I reading too much into my relationship with a work colleague?

Me and this girl joined the company in September and we quickly began hanging out

Honestly we have a level of chemistry and tension that you couldn’t manufacture if you tired

But she’s not into dating coworkers and also has a boyfriend (although I don’t think they’re too serious)

As time goes on we get closer and closer

Now she even texts me on my private phone at midnight sometimes

I will be the first to admit it: I like her. A LOT.

So I’m worried I’m reading too much into it because I want it to be true

But every time I try to distance myself I end up closer than before
And her efforts are undeniable

Any advice on how to come out ahead in this situation?
Am I reading too much into my relationship with a work colleague?
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