There can be several reasons why a boyfriend suddenly wants more space.
Could be family problems, insecurities, an immaturity type phase, or just plain old "fear of commitment".
Here's some tips for "how to get my ex back" when he wants more space.
1.
Play a little hard to get.
Show him, just a little, that it's going to be his loss.
You are still into your boyfriend so you don't want to push him away too much.
But just let him know what "more space" is really going to be like.
Go out with your girlfriends a little more often, rather than spending time with him.
Many times "how to get my ex back" requires making him come back to you by showing him what it feels like when he creates more space.
2.
Remind him of all the good memories.
Eventually when he comes around and realize how much he misses you, and then wants to spend some time together, then take the opportunity to remind him of all the good memories you've had together.
This cements it in his mind that time with you is, and has been, much better than time spent apart by creating space.
3.
Let it ride out if necessary.
Many times guys will go through "immature phases" where they feel they are missing out with hanging out with their friends.
Let them go through this phase, by realizing it is just an immature phase that they have to get past in order to further your relationship.
Many times what will happen is that they will go out more with their friends for the next 2-4 weeks or so.
They'll get burned out, realize in their own way (though they maybe won't admit it) that it was just an immature type phase, and will want to get back with you asap.
Now if by chance the phase doesn't run it's course, maybe it is best for the relationship and it wasn't meant to be.
You certainly can't and should not wait around forever.
Above all, look into relationship advice on "how to get my ex back".
There are many excellent online guides which can guide you successfully on how to get him back whatever kind of situation arises.