<human>: Provide a brief overview of the text.

My boyfriend and I have been dating for a little over a year, and we've suddenly spent the last few months fighting very often. I cry a lot and can be irrationally sensitive. My sister has a terminal illness and her health is declining quickly. I'm under a lot of stress with a few other issues as well. I'm always on edge, ready to crack into upsetment at any issue. I feel as though I'm ruining our relationship, and I feel terrible for subjecting him to my emotional instability. On the other hand, it is sometimes helpful to have him there when I'm upset (though I rarely talk about it). Should I break up with him because I am taking my stress/problems out on him? Or is it fair to keep him involved when I am not completely available right now to devote myself to a happy relationship?
<bot>: I'm dealing with a lot right now, and feel guilty for accidentally taking my stress out in my relationship. Should I end it?