She rejects the younger man while she cries and says sorry (since she clearly loves the younger more) to choose the older man right in front of him. Then several years pass (or at least enough time for her hair to get long and for the Young MC to mature) and she's dating the older guy pretty seriously - while hallucinating about the younger guy cause he's the one she should be with, but she doesn't realise it. Last chapter had any progress she'd made towards realizing she should go be with the Young MC wiped away by the older man kissing her. Also they're (FMC and older guy) wearing matching rings, but on their right hands so maybe not marriage I hope. Anyway it's the opposite of what I'd wish for and I fear this will never end the right way. I'll just have to keep my fingers crossed and check back in a year or two.
The panel of her saying sorry while crying and making the saddest most heartbreaking smile while she lets the Young MC's fingers slip off of her hands and turns away... was gutwrenching. Unless this ends with her and the Young MC having a happily ever after, then it's only safe to read if you're an emotional masochist.