Help!! i don't know what to do or say!?

me and this guy went out twice but broke up within a week or two, we went out about 2 years ago. since then we've gone to dances, we hooked up (not like had sex) and gotten really close. when ever i talk about other guys or bring them out he starts interrogates me and freaks. we talk everyday and he is probably one of the closest people in my life. everyone says we have a thing and act like a couple. i know he has feeling for me but won't admit it, he's always trying to make me jealous and flirting with me. he's even said he loved me more than once, and i can see how much he cares about me even though he shows no interest in a relationship. about a month or two ago i asked him if he ever saw us being more than friends or going out and he said i don't know (which sounded like a nice way to say no) now here's the problem a couple days ago a guy i liked asked me out, and i said yes. i don't know if i should tell guy 1 and if i do i don't know how. i feel like he's going to be really mad or upset and i can't do that do him. should i tell him? if so how? or should i just let him find out/figure it out on his own? HELPPP!Help!! i don't know what to do or say!?
( read the following with a Brooklyn accent, it would be like you're actually hearing me talk to you )

First of all if you're with someone who you consider #1 either on a date or just hanging out, you never bring up " other guys ". No matter how well you think he handles it, it's the last thing he wants to hear. It's obvious he's gotten to first base with you, but he appears to have some difficulty in the commitment department. Acting like a couple and going for the brass ring are two different things. I don't know how old you are and I don't know if he's ever hit a home run with you but what you should do if you're looking to go steady or if you want to get engaged is to level with him. Lay your cards on the table. These things need to be phrased so there is no misunderstanding. No mention of guy #2 or whatever. Just a plain statement of your intentions and what it is you need from him. This way he knows exactly where you stand, and he has no alternative but to tell you where he stands.
Guy 1 has no right to be upset about it, he said that he doesn't want a relationship with you. If he does get mad tell him that you dint appreciate it and when he feels like being a better friend to you then he can call. Don't play his little game...and yes, he is playing a little control game with you!Help!! i don't know what to do or say!?
you should probably tell him. just say it straight up, conversationally. if he takes it chill, leave it at that, if he freaks, just say

Guy 1,

i'm not sure what you feel about me, but you haven't shown any interest for a while, so i thought it's time for me to move on. and i'm into this guy and it's my own decision.



or something like that
That's messed up but you got to be the one to step up before he finds out from another source. It's better he hear it from you than somewhere else. Just tell him that you got asked out and you said yes and that you're in a relationship.Help!! i don't know what to do or say!?
You can tell him casually. Don't make a big deal out of it. But just tell him. And if he gets upset, remember, it's his own damn fault that he isn't dating you. You have every right to move on.