I get why people have started shipping TF1 Megatronus/Prima as a MegOp parallel, but I rarely see anyone bringing up the parallels between Optimus and Solus.
From TFWiki (emphasis is my own):
Megatronus confronted Solus Prime over Maximo's suit of armor, which had been completed long ago but had never been delivered to its intended recipient. Their disagreement eventually grew into a full-fledged fight after Megatronus killed her pet, which had secretly been recording Solus Prime's actions. In the chaos, Megatronus fired the Requiem Blaster without thinking, fatally wounding Solus Prime. Before Solus passed away, however, she professed her love for him. Solus's body returned to the core of Cybertron and Primus, and the passage it left behind became the Well of All Sparks.
Their quarrel isn't always over the same artefact, but across the various continuities (and the mess that is Aligned lore) she's almost always killed by Megatronus. They're in love in every lifetime, but it never saves them.