Normally don't ask for relationship advice BUT

Ladies, i don't normally ask for relationship advice but I feel so stuck! I've been with my bf for 4 years and this last year he spends 2weeks in another country, 2 weeks back home and this time has made our previously existing problems so much worse that I have been crying daily for this year. Basically , what annoys me the most is that he never shows empathy, I struggle with depression/bipolar/eating disorder yet he never takes it seriously, then he can easily go day without even texting and asking how i feel (even when i know he is not working) and then say "no, i was worried about you" then why tf you were online and never reply/text, only super late. And lastly, he promises things he won't do,

Like "I'll call you tomorrow morning " or "I'll come to you at 4pm(and shows up at 9pm without texting he'll be late). I say that it is a form of disrespect of me and my time because I need to plan my time yet he doesn't change. And says I'm over exaggerating and being overly sensitive (which i am a little) but still. We have talked it out and I have clearly said how his actions makes me feel. After argument 2 days are good and then he returns to his previous habits. I know I can't change a man but

I cry like a little baby daily over this yet I feel so stuck and can't take any action.

Am i really just being too sensitive and shouldn't blame him at all?

Oh, only thing that keeps me to him

That i know he is super loyal and all that but is loyalty really so expensive to cry daily?