<human>: Hi!

I (29m) ignored her (21f) on vday and now she's unresponsive. 

She is he sister of one of my close friends. We connected at a party and I decided to pump the brakes and only connect on social media so that I could check with my friend before I try to kindle the fire, out of respect for our friendship and because of the age difference. Friend told me that I had the green light but to be cautious because she had recently been talking about trying to get back with an ex and she doesn't think it's a good time for me to pursue her romantically . I decided to be friendly only and message her about some topics that we talked about in person.

She was responsive and then went silent for a day. She came back and replied to a message late night on vday. Could not have been a booty call because she's over an hour away. I suspected it was because she wanted to talk to someone she likes on vday. I'm hoping it was just another day to her but I kind of doubt it. Well, I remembered what my friend said about her trying to get back with her ex so I felt like chatting late night on vday would be a bit more that just friendly. I read her message (she could see that I read it) but I did not reply. I waited until the morning to reply. Now she is unresponsive. 

In your opinion, what is going on? I'm crazy about her but I want to take it slow. Do you think I ruined my chances? What can I do?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Ignored a woman's casual late night vday message and now she's unresponsive. Do you think I ruined my chances? What can I do?