You can't use forever in this way. It means For all time At all times constantly It isn't a fixed point in time, so you can't do something 'until' forever. Since may not be the best choice here either.
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ANATOLIAN_EAGLETHEN WE CAN'T SAY :And stop writing that large letters unless you are less than 3 years old.
i will never leave you since today till forever.
WE SAY:
I will never leave you.
ANATOLIAN_EAGLE
THEN WE CAN'T SAY :
i will never leave you since today till forever.
WE COULD SAY:
I will not leave you till/until I die.
Actually i also have a similar question
Which one is correct ?
??????
* We've been friends since college until forever .
Or
*We've been friends since college till forever .