Is my engaged colleague stringing me along?

DEAR DEIDRE: MY colleague goes out of her way to speak to me, making excuses to see me after she has finished work for the day. 

I am a 33-year-old single man. My colleague is 31 and in a relationship. Recently I have become closer to her.

We have always got on, have similar tastes and seem to be interested in the same things.

She is currently engaged to her partner but is always telling me about her man troubles and doubts for their relationship. She constantly asks for my advice.