Relationships

So I have liked this boy for a while now and he found out a few months ago. Everybody in school knows and he has recently got a girlfriend. This hurts me so much as his girlfriend and I don’t get along! This boy and his twin brother are my best mates and this has really upset me as his ‘boy’ said he liked me, he just needed time as he isn’t really for a relationship. His twin brother has supported me through the last few days and I’m so grateful for that but I still need to talk to the ‘boy’ about the whole situation and I’d love for it not to go horribly wrong as I want us to stay best mates. I was wondering what questions/ things to say to him to understand how much he has hurt me without wrecking our friendship. Any suggestions will help! :)