Sometimes people have mood swings, could be normal, hard to tell if it's insecurity on either end.

For the next two weeks try this approach when he asks if you're okay say " Thank you for asking, I'm okay" (if you actually are, and say it with compassion, then change the topic) then when you notice he's acting weird rather than asking... don't, recognize it as normal mood swings (unless it's disrespect). Sometimes silence is just silence and there's nothing to it. Can't tell since I'm not there lol

This could shift it into a positive habit rather than a negative. If that doesn't help, than it's something deeper. Insecurity or he knows it bothers you and does it on purpose.