Please help - relationship advice.?

I took the decision yesterday to split up with my boyfriend and even though it's only been a day it has been one of the most heartbreaking decisions I've ever made. We keep arguing and these arguments get heated over the most ridiculous of things. Although I've spoke to him today and he's adament that he's not giving up on us, I would love nothing more than us to work all of this out but I'm sick of working it out then 2 weeks later us having the exact same argument and feeling like we're back at square one. I've asked him to give me some space to which he's said take as much time as you need but he'll always be there for me. I'm just looking for some advice, we're only 21 and 22 but he means the world to me and even if I don't have in my life as my boyfriend I couldn't not have him as a friend he means far too much to me. I just don't know what to do!