super confused with my Cappy man

First I'll say, he is a Capricorn born Jan. 11th. 20 years old. I am a Scorpio woman born November 7th. 23 years old.

Ok, we used to work together and it was strictly a working relationship. I thought he was cute, but stayed focused. He never thought twice about me.
Fast forward a few months and I'm not working with him anymore. He adds me on facebook. Asks me how my life is going. Immediate connection. We just keep talking and talking. We have almost all the same interests and we think the same way for most things. He is VERY mature for his age. And before we knew it, we both admitted our feelings to each other.
He tells me that he has never loved someone so quickly, and i honestly believe that because of his personality. He is very careful and conservative. I knew right away that he was a very loyal guy, not the type to cheat or play games. All serious when it comes to love. He treats me like a princess. And it feels amazing. I try not to take advantage of that, and I always try to make sure he is happy and knows how I feel about him. I want him to feel as secure as he makes me feel. I never hide anything from him, although he has his walls. He is a man who likes his secrets. Sometimes as a Scorpio that's a little bit difficult for me, but I always try to be patient and give him the benefit of the doubt.
My confusion is, he used to tell me that he puts me on his priority list at the same level as his family. He always checks my messages first, and things like that. And I loved that. But then it changed a bit recently. I feel like he's been a little more distant. It's hard because he was busy for a while, but I would think that if he is super busy. That when he had a chance he would check on me. But sometimes he checks his messages and doesn't even read mine. Then he replies hours later feeling bad because he didn't read my message that I was having a horrible day or something. This happened multiple times.
He talks about how he wants to marry me and he wants to make so many plans, but then sometimes he'll say "let's stop making plans because they might not happen and we'll be disappointed." So then I feel like I can't talk about the future until he brings it up again.
Am I doing something wrong? I am trying so hard to understand him. I believe he loves me. I know he wants to marry me someday, but sometimes he doesn't even call me on the phone for a few days, when we haven't seen each other in person for a while. And things like that, I really need. I need the phone calls when I can't see him, but instead I just get him ignoring my messages for most of the day.
I don't want to push him. I try to be patient and understand. He is amazing. I know he is worth it. I want to keep being patient, but sometimes I feel like I just wanna scream, but i know I couldn't live with myself if I hurt him with my temper. Can anyone please help me make a little sense of my man? How can I let him know my needs without him feeling pressured or wrong?

Talk is cheap, in fact it costs a person nothing.

Messaging on Facebook does not make a relationship. You need to spend some quality time with this guy. Get to really know him, not just his presentation of himself, and vice verse.

Stop talking about marriage and kids and the future and focus on the now. Aim to spend a few hours a week together. Than a few more hours the next week. Take it day by day.

What happened or what was said right before things changed?

Posted by truecap
What happened or what was said right before things changed?

Umm, everything was pretty normal. We don't fight. right before things changed he got super busy preparing to come visit me, and I tried to understand it. But then he never really changed back. Once he got here, he started spending a lot of time with friends and telling me that we can meet afterward, but then later he tells me that he is too tired or he waits until like 6pm to tell me that he doesn't know when he'll be finished with his friends, and to not wait for him. 
It's a bit frustrating because I don't make plans when he tells me that we will meet, and then I end up waiting all day. He is only here for 3 weeks, and so far I've seen him twice. Once when I picked him up at the airport, and again on a date. That's it.
The long distance thing isn't really an issue for us. Never has been. But, I just can't figure out how to get back on his priorities list.

Hmmmm....I wouldn't wait around. Stop making him a priority. Don't try so hard.

He's either got a lot of people to catch up with or he's not that into you. If he doesn't make more time for you, don't give him a ride back to the air port.