How Boys talk

Maybe he is shy? Sometimes guys are less comfortable expressing their feelings in public. Maybe when you guys are in private, just the two of you, he can express his feelings better? Maybe he's comfortable expressing this stuff in messaging, but you two haven't spent enough time together in physical reality for him to get comfortable. Spend some more time with him, and see what happens.

Some guys are a little embarrassed to be talking all sweet and stuff in public, they think it'll ruin their 'manly-man' image. Or he's just shy, because most times people are a lot less insecure about things via email or text message just because you can just delete the chat and avoid the person for a week of you do something terrible.

It's probably just because he is more comfortable expressing his feelings over text messages rather than in person. It's only natural to do that, especially for people that are shy. I talk much more online than I do in person, but it doesn't mean I'm being "fake" or anything. Same goes for him probably.

I know he's not shy because he tell me not exactly everything but just things he knows I would ask. We have been together for a year and half already, maybe he just doesn't want to show his sensitive then?

Some guys are like that. I am. I can't communicate as well with my gf in person as I can online. I try but can't. Although there isn't as much reason to do so. A lot of non verbal communication happens in person, it's not that he doesn't care for you (unless he's a major jerk). He probably just doesn't understand what you're feeling. It may not seem like the best but maybe you should bring it up to him, some guys just need a little help.