Is it normal that my boyfriend never messages me?

It's hard to really make any judgments or form any strong opinions on this whole thang, girl. There's a good possibility that he may have lost interest in you or met some other chick that he preferred, but then again he could just be über busy. Please don't fret, because Lord knows there's plenty more fish in the sea. I know it's cliché, but it's true. Try not to get overly attached whenever you meet a new boy that you like, and remember that actions speak louder than words. Beware of people who are constantly talking about the future and making you grand promises when you hardly know them. You probably ain't gonna like my saying this, but ya'll are college students which basically means you're both still kids even if you're a legal adult. Try not to let anyone sweep you off your feet too easily.

I'm sorry you got harassed by that troll. Don't feed them.
I'd go with Tinybird's answer. Ignore him for a while, see if he comes around. Also, have you asked him why he's ignoring you? I mean, I often have a lot to do, but then I tell my girlfriend why I'm so busy. There's really no reason not to do that.
I hope he did have a good reason and you won't get your heart broken.

Long distance then staying at your parents place for ten days? Not a natural relationship at all. Chances are you weren't attractive enough for him.

And the text thing is called 'fading'.

This isn't going to be what you want to hear, but it's what you need to hear. The truth is that he might have liked you at first but it's obvious he no longer feels that way now. He isn't putting in any effort and isn't willing to give you even seconds of his time, he is not chasing you. He doesn't try to talk to you, he doesn't bother responding to your messages. You said you think he's busy with his studies, but if that's the case why doesn't he just say so? I mean it takes literally seconds to type a sentence or two. No one is that busy, he just doesn't care. You said the last time you spoke to him was over a week ago? Most people use the computer daily, especially students so he just didn't want to talk to you. Also you asked him if you're dating or not and he didn't know? If you really like someone you just know. I mean you know for sure you like him right? You would want him to be your boyfriend and wouldn't need to wander for a second right? If he doesn't feel the same way don't bother because he certainly isn't going to. He's just going to talk less and less until he disappears from your life, it has already begun. You shouldn't message him at all, you should ignore him and see if he messages you. If you hear nothing for 2 weeks you can be sure he doesn't give a single fuck. It's a waste of time to chase someone who doesn't show any signs of caring about your existence. You're only going to make yourself sad while he doesn't even think about you. Please don't take any of this personally, like don't think you're not good enough or something like that. You just weren't exactly what he was looking for. Everyone has their types and you don't choose who you're attracted to. You were cute enough to get the attention of a half-Japanese guy in the first place (lucky :D) so don't worry, he wasn't the first guy to like you and he won't be the last :)

Sounds like he's lost interest or is losing interest in you. Maybe don't be always so available for him and let him know you are having a social life, meeting up with people etc. Don't answer his texts straight away and don't always be the one to contact him first.

Maybe even say you are going on a date with someone else and see how he reacts? His lack of interest could mean he's met someone else too, or he's just lost interest because of the distance. LDRs are hard when there's no end in sight.

Are you goodlooking?

He might have met another girl... to me thats how it sounds like :/

When a guy says he doesn't know if he wants a relationship, it either means he's worried, unsure, or just in it for sex. It doesn't matter if he met your family or if you guys had sex, because a lot of men can separate love and sex very easily.

What you need to do when guys say they're unsure about dating is give them space every now and then. Until the day they actually say yes to dating or call you their girlfriend, then you're either a person of romantic interest or a friends with benefits.

Oh yeah, just to add, I'm 19 and he's 21. He's in university right now. And he seems too mature to be playing around like this. :(

Why is everybody so horrid? Ugh! Sister, you don't need him. Forget him and move on
Or just ignore him. Chances are he'll come crawling back to you in the end, if he really was serious. Then you can tel him where to go :)