I want to leave my bf but I really can’t

So I’m in a relationship for more than 4 years now

we love each other a lot but we are facing so much issues

he doesn’t care about me anymore doesn’t show his love

never tries make efforts to make me happy

recently he also started disrespecting me

but he promises me that we’ll have a great future together

we are in a long distance relationship since 1st day

we didn’t get much time to spend with each other

I really want to get over it

i want to end this relationship bcoz it’s not working out

i trued talking things with him

but he doesn’t care

idk what to do

this stress is affecting my studies and career a lot