She just abruptly end the conversation. What did I just do?

Erwin
There's this girl, she was my college friend, I haven't really talked to her after graduating. Few months ago I asked her phone number through Facebook on her birthday. I didn't contact her. Today I sms her wishing merry Christmas, she replied but I fell asleep so I didn't reply. She sms me the 2nd time asking where I got her number. I explained to her but said that I always forgot to contact her (I just woke up so I didn't really know what I was doing). She replied again but she just abruptly end the conversation like "oh okay, have fun then". Do you think she's mad?
She just abruptly end the conversation. What did I just do?
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