Midnight Sun (2018)

This is a youthful romantic drama (with comic elements), and if you are a fan of those, and I have to admit that on occasion I really do enjoy an entirely predictable plot line that ends on a note you can see coming a mile away, then this might just fit the bill for you.  This one has one protagonist with a fatal illness, instead of The Fault in Our Stars, which has both young lovers at risk.
Xeroderma pigmentosum—a one-in-a-million skin ailment that makes exposure to the sun’s rays potentially deadly—wouldn’t necessarily sound like the stuff of romance, but it is at the center of this love story.  Katie has watched Charlie grow up as he has gone by her window every day for much of her life, and as someone who can't go out and meet him, he has become the center of her dreams.  She ventures out only at night, and has a chance meeting with him at the local train station, where she is busking.  He falls for her, she doesn't tell him about her condition, the sun rises, and the rest is just as you would expect.  The end.