i feel bad for my partner

i (21nb) feel bad for my partner (23m) for being with me.

i cherish him and i know he cares about me but sometimes i feel like im a burden and only make things worse. for example, both of us were having a bad mental day today so i wanted to call (we are long-distance) but instead of cheering him up i think i only made him more down which has brought me down even more. i always feel awful when i express my emotions because of the effect it has on other people and now I'm seeing it happen in real time. all i want to do is apologize repeatedly but i know that doesn't make anything better and will probably just make me feel even worse by morning.

i feel that i am inferior because of being bipolar. i feel that i am unworthy of his time and caring. he hasn't done anything to make me feel this way, it's not his fault.

we haven't been together for very long so i feel like it's too early for me to be having so many issues and he's going to leave me.

he has struggles with anxiety and has a psych degree so he says he understands but i don't think he gets the depth of my experience.

i don't know if anyone else feels this way or how you moved past/overcame it. how do you communicate the experience of depression and mania with someone? does anyone in a long-term relationship have advice for dealing with these feelings of inferiority and unworthiness?