I like a twin brother..and i think he likes me too..but im not sure..so any twin brothers out there..help me!!?

ill try to make it as short as possible...we both know each other through a mutual friend...they both are quiet..the elder one whom i like..is not shy but he doesnt knw how to talk to girls and the younger one..is very shy..and my best frnd likes him...so..my crush and i...make eye contact..and usually im the first one the break it...once....i took his marksheet from his hand...and he was just looking down at me and smiling...he never breaks eye contact while talking to me...when we see each other..he just keeps looking at me..like he is waiting for me to say hi.....and when i smile back at him..he returns it with a broad smile...when we saw each other after a long time..we both gave each other a really wide smile...and at the same time....thts the same day the marksheet thing happened...but then the next day...we saw each other...i said hi with a smile..and he said hi..but it was not very proper...and till we passed each other we both just kept looking at each other...sometimes while talking to my friend..he keeps glancing at me...and once he was doing something with his phone and i looked at him..he was looking at me fro the corner fo his eyes...about once or twice he was looking at my nails and feet! what i dont understand is..why is he very nice to me one day...and the next day...he is seems like nuthing happened..sometimes i feel like he likes me back....but then i just push it away coz im the 'think too much' kind...and the problem is he doesnt talk much....so i have to make a great effort to get him to talk..but when i ask him something..he replies properly..not like he isnt listening....and most of the time he has a blank expression...when im talking with his frnd....and he isnt part of the conversation....sometimes....he will just keep looking at me with a very blank expression which he has most of the times....i dont understand him...now...the thing with his twin is...more than his brother...his twin keeps looking...and recently ive noticed..he says hi when im saying hi to his brother....and he looks at me with a slight grin....now he is the shy types..and when i look back he doesnt turn away...so he doesnt like me...once i was standing about ten feet away from them....with my frnds..and we were talking...and his twin kept looking in my direction smiling...and then after some time my crush who was on the phone turned back too....with a slight grin ...and like i said my best frnd likes him..once we were all standing together..and i was going to ask my crush his no. and his twin snatched the phone from my hand...and gave me his no..now he woudnt usually do that..i think he was just trying to act cool in frnt of my frnd..coz he spoke to me that day..more than he ever does! i dont understand both of them...and one more thing..my other friend likes their best friend whom im very good frnds with..they know that the liking here is mutual..so does his twin look and smile coz he knows about them or somethng else? and does he behave like this coz he doest know how to act around girls? or do u think he likes me? and wht do u guys think i should do?? im not going to tell him directly....i dont want to freak him out...but sometimes i do drop hints...if u are a twin guy it will help a lot...do try and give me tips on understanding twins.. :D :) atleast giv me some suggestions....its been 6 months..nd im getting really frustrated! thank you!