Was I being rude?

I asked my coworker (Mia) out and we've been on two dates. Each date was 3-4 hours long and we had a great time. She shared a lot about herself so I got carried away and said I'd like 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 that the two of us should stop meeting. Mia was upset at this and asked why I hadn't told her about the other girl before and why I only told her this during the end of the 2nd date. She walked off and hasn't spoken to me after this, we're both 26 and it's really awkward at work.

Was I being rude?
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