Burnhams father was killed by Klingons. Burnham then falls in love with a human-klingon hybrid (for lack of a better concise phrase) who kills her shipmate. She then falls in love with another man who has his entire planet accidentally 'murdered'. That man then pals around with ANOTHER murderer who almost gets all of humanity killed. Meanwhile, Stamets has his husband murdered by the human-klingon hybrid and then has to work alongside said murderer. Stamets then loses his shit at Burnham, calling her a murderer for leaving his unmurdered husband on a hellplanet. Lorca and Admiral Cornwall were in sort of a relationship until Prime Lorca vanishes (presumed dead) into the Mirror Universe. Then Mirror Lorca gets killed AND Cornwall gets killed. Ariams husband gets exploded and then Ariam is killed via sanctioned murder. Most love stories on the show involve someone being killed in some horrible way. I was about to mention Grey/Adira being the only one who didn't have death involved but then I remembered the giant asteroid that obliterated the colony ship and fucking killed Grey. Saru and T'Rina. That's it. That's the only relationship in the show I can think of that doesn't involve tons of people dying.