My good friend (and recently fwb) just stopped talking to me?

atlbelle
Hey so I'll try to keep this short.
My good guy friend, who I've known since June, and who I recently (November) started sleeping with just quit talking to me this week.
We hung out this past Friday (and had sex) like usual and I dropped him off Saturday afternoon. We had a great time, when I left he was normal. Hugged me, told me to text him when I got home, etc. but aside from a FB message telling me his phone was turned back on and giving me his new number, I haven't heard from him. Which is really odd cause we talk almost every day. I tried a couple times to start a convo and just got an "lol" or "okay" or something similar back.
Today, I posted a status that was kinda sad (I can't go be with my family for xmas) and he messaged saying he was sorry and asked if I was okay, but it was very formal and weird. I replied then mentioned he's been quiet this week and asked had I done something, but he read and ignored the message (F you too, FB messenger).
I'm not gonna push it with him anymore, cause I don't want to make it more awkward but I'm just wondering if anyone has an idea why he would just decide to stop talking to me.
Thanks.

*note: he knew there was a good chance I couldn't be with my own family this Christmas and invited me to be with his so I wouldn't be alone. This was when I last saw him but now that things are weird and he didn't mention it when he was apologizing earlier I feel like that offer doesn't stand now.
My good friend (and recently fwb) just stopped talking to me?
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