Wtf and why would someone do this?

Now, what would cause a guy to go from being super sweet, complimenting you, holding you close, kissing your hand or your forehead to suddenly being ignored for a whole week, then BLOCKED.
like last time we hung out we were talking and I gwt not planning anything and or the fact he's going through something because he's currently staying at his friends but I almost lost my brother in a really bad vehicle accident , ironically 7 hours after we hung out when I told this guy it was unsafe fir him to drive tired and everything. Both of us were in agreement. and I needed this guy, we were talking the day of the accident, and the day after that, radio silence.
I just don't get it. I had asked a question and told him how I felt so I could get a gage on how he felt so I knew how to present or whatever not try and be overbearing and I'm sure that's exactly what happened. But I really liked him and of course still do and this is all after opening myself back up for someone after being severely hurt in the past and it's just bullshit and it doesn't help he's got something I left in his truck and sure I have him on other socials still but it isn't worth risking, I don't think anyways and I'm just torn and confused
Wtf and why would someone do this?
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