I would do therapy before calling it quits, but I think so many rush into relationships and we end up in this trend of divorces happening so often. I think it's because people rush into a relationship, and sometimes go way too far and in turn they find out they're stuck in a relationship they don't want.
I've heard people getting married as soon as a couple months to a year together. Honestly, I think you should be dating someone at least 3-5 years before marriage. That's how I feel anyway. People who date for weeks, and then get married are just crazy imo. Like, don't rush things.
But, it's not always that. I think some people just grow apart. I truly believe that we as mammals, are intended to mate with more than one woman, but society has deemed that wrong because of religion and marriage. I think a lot of the times, it's just people losing interest in one another. And I don't think therapy can solve that.
But, I still think going through therapy would be best, and then go from there.