I adore Sev, but I like him single. In JK's interview, she said at one point it is more than likely that Lily was in love with Sev, but his love for the dark side made him lose out. They were best friends till the 7th year, where finally Lily breaks it off b/c of Sev's dark love. So Lily was in love with Sev at one point in her life.
But all in all, in many respects at least, Sev was 100X times better than James, and I'd choose a guy more like Sev. He was 9 when he saw her red hair fly, he was in love, haye. He loved her for basically his whole life ji, and that is soooooo aaawwww(yup I'm a sap lol). His patronous, his life for those green eyes, haye. He protected Harry who looked like James from head to toes, the guy he hated most, only b/c he had Lily's eyes. I don't dig the James/Lily pair, but I prefer Snape single like this. I just love the way his love was. A confused soul that never understood how to express the love 😭