Should I ask my boyfriend why he ignored me for days or let it go?

My boyfriend ignored me for a couple of days out of the blue and it seemed like he was very angry with me and I was not sure why. He came back acting like nothing happened but almost started an argument with me but I wasn't going for it. We haven't even talked about what happened and it seems like he's moved past from it but its still in my head curious to why he was avoiding me. We've been on better terms now and I don't want to bring this up to kill the mood but it's driving me insane. I'm not sure if I should just let it go or...

Should I ask my boyfriend why he ignored me for days or let it go?
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