i really need some advice, please

my boyfriend of 2 years and i broke up in august for reasons along the lines of being each other’s only sources of happiness, and being too attached to an unhealthy extent.

we promised to work on ourselves to someday have a healthier relationship. we have baby names picked out, our families love each other, we have our future very thought out and i love him with my whole heart. we are set on someday getting married.

he just got in another relationship... i am heart broken. we still talk, too. i asked him what about our future and he says “i don’t see that future with her. only with you. but i love her and can’t leave her right now. but i will once i graduate college and then you and me will be together again”

is this reasonable? apparently she helped him through our break up, and was “super kind” to him and baked him treats, let him cry to her, and was always there. he says he fell in love. and doesn’t want to break up with her right now.

WHAT DO I DO?? do i wait for him to end things with her? or just leave the whole situation. please help