problem of feeling?

my friends told me....elf say my feeling change everyday...tat means sometimes happy sometimes unhappy....the mood is change everyday....ya...y i will lik tat??cause because she....y i unhappy??cause she didn't decide me...y i sometimes will happy??cause i saw she happy....den i happy...i know...tat my false...so nw i'm change nw...i won't lets she know i'm unhappy...n last years ....i'm very lik to think the negative things 1....if she talk wif other boy or play wif other boys...i will unhappy...i think is jealous....so she very hate me lik tat....but i also dunno y i will lik that??i think is i wont u let go away from me...so i jealous....but now i wont do it again...cause she didn't lik...so i will change it...go anywhere ...i also let she see me always happy...wont do it again...but izzit i change it ald den she will accept me to be her bf???.....izzit can???or i think too much..T.T....