Do we just live and suffer and die?

Largely, yes. As far as we know, there's no grand purpose nor reason of being. We're all just floundering about, trying to answer the fundamental questions of existence for ourselves. There may be an objective answer, however, which is why I do what I can to push humankind in the direction I believe is most likely to result in that discovery - even though my significance is only comparable to that of an ant.

Regarding your loss, specifically, I was in a very similar boat ~12 years ago. Honestly considered just riding into the sunset in search of Bob Ross, at the time. Today, I'm extremely glad to have stuck around to raise another cat who loves me beyond anything I ever thought comprehensible. In short, when life as a whole sucks, there's respite in the moment. When the moment sucks, take respite in the whole of life's experiences.