It's all because I used to be a huge hipster who only ever liked jazz. You gotta like sap if you're going to listen to that stuff.
My favourite song of all time is still Chet Baker's Time After Time, and all his versions of it are good but this--this one incredibly specific one that I can't, for the life of me, find anywhere other than Youtube (I think it was live at Boston, 1954)--is my absolute favourite: https://www.youtube.com/watch?v=00eq3Uh1hPE.
Chet Baker's entire oeuvre is ridiculously romantic--the guy's got sap coming out his pores. His versions of My Funny Valentine, My Buddy, and While My Lady Sleeps (bit neckbeardy of a title there, innit? There's a set of words utterly ruined.) are all very bloody good and very bloody sappy.
Almost all of Gershwins songs fit this template, especially when they're sung by Louis Armstrong and Ella Fitzgerald. I'm pretty fond of Our Love is Here to Stay. It's kinda cheery sounding, actually, but there's such a strange... genuineness to it? Something about it got to me. Maybe I was just in a strange mood at the time.
Louis Armstrong's Give Me A Kiss To Build A Dream On is also fantastic--much slower and more, I guess, classically sappy. There's a weird... Pixar feel to it. It feels like a song Pixar would have used in their heyday. It's my go to 'oh that's a super romantic sappy song right there' that I jump to in my head.
Madeline Peyroux's version of La Javanaise has very much the same feel. It's just... it's so romantic, dude, you don't even know. I'm, personally, a very un-romantic person, but it's the sorta song that fills you with a longing for that whole fake romanticised version of Paris where it's all gentle lights and people dancing and there's no racism or anything of that kind.
I've also got Same Drugs by Chance the Rapper. It's not actually literally about drugs that's like a metaphor. It's got Peter Pan metaphors and stuff too, it's wild. And, uh, very tender.
It's kinda weird to say considering the bloke's reputation and the fact that he's completely nuts, but pretty much any of Kanye West's songs dedicated to his family are so utterly genuine and sappy (maybe love song is a bit of a stretch, here?) that it's almost easy to forget he's, uh, completely nuts.
Violent Crimes is him sort of, reflecting on his own misogyny, and the misogyny of men in the world in general in the face of his growing daughter admitting that--while it's irrational--he doesn't want her to grow up, become a woman, because he's terrified for her.
He's also got Family Business (about his family, obviously,), Only You (about both his mum and his daughter. He sung it with Paul McCartney, lucky guy, I'm sure he'll blow up after this) and, uh, probably a couple other ones. Guy likes his daughter I guess, what can I say.
Those songs probably have swears in them by the way, if you wanted to watch out for those.