Losing Feelings, how to cope

Let’s start by me admitting I have issues, I have my own set of issues & i haven’t really dealt with them & recently i’ve become unbearably sad. I’ve thought about killing myself, about all of the quick ways to be done but the only thing keeping me from that is my fiancé. We planned on getting married November 2021 but the past few weeks with him haven’t been the greatest. I feel irritated with him all the time, i get upset when he doesn’t pick up after himself or when he doesn’t want to have sex, which he 100% has the right to say no & i know that i shouldn’t be upset with him about that which is why i know somethings wrong because i’ve never been that way him. i love him so much & it’s out of character for me to not be super sweet & clingy, i just feel so confused right now 😣 anyone deal with something similar? some days are good but it’s not very often anymore... i want us to work i just don’t know what i’m doing