I dont know when to contact my ex, I want him back so much!

its a long-ish stpry but ill try and shorten it, this guy was my ex’s best mate, he declared he loved me and at first I wasnt keen as I hated him after he made life so hard for me at the time, he spent nights sending me long emails and begging for me to give him a chance, I did, and fell in love with him. we have been together for a while and im head over heels and I believe he is too, hes told my mum he loves me! well the other day I was in a really bad mood and threw a little paddy and ended up finishing him by text, I then realised what a stupid mistake I had made and text him to apoligise, by this time he said that its too late and we are over, I reacted awfully crying and ringing him he wouldnt pick up, he text me telling me he loved me and I could go stay with him at uni whenever I wanted but he needs some time to think as we arnt working atm but after time he will want me, I dont know if he said this to make me feel better, however I want the benefit of the doubt and to be able to prove to him that im not going to take things out on him. this was all yesterday, I know its soon but its unbearable not having him in my life even if I dont see him till weekends anyway. I need to go where he goes to uni next week to do some work, and im wondering wether to contact him as friends and tell him im coming and ask if I could stay at his for a night, on the sofa obviously… its only been a day but im going mad, I really dont want to lose him, we lost a lot of friends when we got together as people said we were hypocrits, we work so well together, loads of people have said, and im not ready to throw it all away over a stress I had… any advice on what I should do, I know hes the love of my life, I may be young but I havnt experianced what I feel for him before x