Come to think of it, all of the romances have potential over the top drama/conflict don't they?
-Alistair potentially dumps you if he becomes king,
-Morrigan has been playing you the whole time and just leaves you at the end of Origins,
-Leliana will try to kill you if you desecrate the ashes,
-Zevran probably cheats on you and potentially betrays you when Talisen shows up.
-Anders mass murders a bunch of people and starts a war, potentially tricking you into helping him
-Fenris hits it and quits it, leaving you hanging for 3 years and he doesn't pull any punches with his hate of mages even if Hawke is a mage and romanced it seems really emotionally abusive
-Isabella probably cheats on you and causes the whole conflict with the Qunari, also possibly abandoning you,
-(I dunno about Merrill, I hate her and couldn't finish her romance)
-If you count Sebastian as a romance, he never does anything romantic with you, not even holding hands or a kiss on the cheek, and instantly dumps you and declares war on the city if you don't kill Anders.
-Sera dumps you (as an elf) if you don't agree to give up your culture
-Dorian buggers off to his homeland for good and leaves you behind without even telling you about it until the last minute when everyone else knows
-If Cassandra becomes Divine she obviously can never have a life with you (though they potentially have a secret affair I guess?)
-If you let the Chargers die, Iron Bull attacks you in Trespasser and you are forced to kill him (you deserve it if you chose that
)
-Blackwall, holy crap.
-Solas, double crap!
-Never did Cullen's romance but it seems normal?
Josephine is the only completely normal partner I can think of who stays loyal, doesn't betray or leave you, break your heart or drown you in lies! 