How to move on from a break up...?

being right there in his midst does not help the process at all. If you can move in with relatives or other friends for the time while the lease goes, I would seriously do that first and foremost! other than that, there is no set time to tell you how long you should be separated before any consideration towards having a friend relationship with each other can be entertained. It may take years, it may take months. It may never happen. you two may just be able to be friendly towards each other. you may be ready for just a friendship, but he might not, and visa versa. take this time to re-gather yourself. remember, even though your heart may be broken, you are still standing, and you are still breathing. Go out and hang with your friends, work on your other relationships with people, do things that you loved to do, but couldn't because you were in the relationship. just work on yourself, and enjoy yourself and this time you have. Being single is not the end of the world!

"how much time should pass before we would be able to actually be friends without any expectations or longing for the good parts of our relationship back" trust me, that will take years to mend, and it especially wont help since you're living together. Just spend more time out with friends and having fun. You're gonna have hundreds of moments where you miss the good times with him, but just like it took alot of work to maintain a relationship, it'll take even longer to get over it. They say when you work for something you appreciate it more, that has an even stronger effect when you lose the thing you worked hard for. Just learn to expect the pain and longing, and accept its over, so you can start the long journey to move on with your life. I truly sympathize with you because I was in a similar experience, so I completely understand. It'll take a while.