Taking a break and how to cope

My boyfriend and I haven’t been feeling like ourselves lately and have been feeling down. He said he wants us to take a break to better ourselves mentally. The big catch is that we will be treating this like a break up and treating each other like friends. After we are better we would get back together. His reasoning is that he wouldn’t be able to focus on himself if we were dating. He thinks it’s a great idea but I don’t. He’s spent time in the past trying to better himself on his own and it didn’t work out so I feel it would be better to work through this together. He said it could take up to a year or two till he would be ready. He told me this yesterday and the night before we had our first big argument. He loves me with all his heart and I love him with all my heart. There’s nothing else besides how we’ve felt recently causing this. Any opinions on this and how should I cope with it?

UPDATE: He dumped me because he doesn’t know if he “loves me or not”