My boyfriend has been really distant, what do I do?!

there might be some possibility that he's facing some problems that he is unable to share with you.if you feel this way,then just call him and tell him what you feel,tell him him that you are feeling like u guys are drifting apart.there's no pint holding back these feelings because eventually it will cause doubts and misunderstanding in your relationship therefore you should just talk to him and sort it out.it may be a little difficult for you but you just give it a shot if you'll talk nicely and be able to get your feelings through,he'll understand.

As hard as it is to hear, the one who shows the least affection has the most power. As hard as it is to do, give him space. Let him sort out some issues and only message him at the end of the day to say goodnight for a few days.

There could be multiple things going on that could be the cause of this, try not to try and analyze it too much. He could be busy, having family problems, school, etc. Some guys just need space sometimes, guys don't take texting/messaging as serious as girls, they don't think to text first all the time or think that it will bother you. If you're worried, just ask him what's up, if everything is ok. One thing girls will do is overthink these situations so much and get upset and a lot of times, it's nothing serious. Try not to worry as hard as it is! You've been together so long, don't be afraid to bring it up. :)