Was this rude of me?

I asked my coworker (Mia) out and during our first date, I started talking about marriage, her puppies and how I'd love to meet her family.

Long story short, at the end of the 2nd date, I told Mia that I was interested in another girl and was going to pursue her now. Mia was very upset at this and asked why I hadn't told her about the other girl before and why I misled her. She walked off and hasn't spoken to me after this, we're both 26 and it's really awkward at work.

Was this rude of me?
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