the thing is usually people don't like to open up because it's really hard to speak when you're upset that you might end up crying, I too can't control myself from crying when someone asks if I'm okay, but I feel like most people feel more upset when they aren't asked if they're okay but the other half usually likes to be alone and doesn't like to share their problems with anyone, it could be because they don't want that person to worry or it could be because they don't trust that person, it all really depends.
hopefully I answered a little of what you're asking.