My friend and I have been good friends now for almost six years, and we are now at sixth form together and are in a class for one of our subjects. Recently the topic of coursework came up and I submitted my idea for a project first. He then went and submitted one which was similar to mine and he wasnt allowed to do it. He then got really angry with me and started swearing. He says he has been mentioning it for moths and that he wanted to do it, but I didn't know this and I didn't mean to "steal" his idea. He hasnt talked to me since and refuses to even acknowledge my presence. I don't know what to do, should I just ride it out or say something? Thanks