
Because when you are in love you can't see clearly and rationality goes out the window. Don accepted and she started to hope. That hope grew and grew year after year together. Only Don, the one who wasn’t in love and could be rational between the two, had to put a stop at the relationship if he didn't love her.
"A chance" doesn't last all those years. Don truly used her

10 years passed though. Heartbreak or not, he was using Nami (even if she asked it.) and had to stop it. If you are a good person, you should take in account other people s emotions too (at a certain point? After a couple of months? But 10 years??) and Dom didn't do that.
If you're a doormat you don't use people. You let yourself be used. But he NEEDED Nami.
He was almost ready to make her his wife (again deluding her) and betraying her as soon as Haero came back. :/
They are all selfish characters, but honestly Nami only asked it out of hope. And Don s actions kept feeding that hope.

So true. I truly agree with this. Stop being irrational. It's hard to study a person's behavior when their IQ level is of an imbecile. It's like I want them to understand but they refuse to do so. It's hard to teach.
Nami not just nami but any other people similar to nami deserves what she got. She chose it, she gets it. It's like what I watchedfrom a tv show and says "A woman who invited a gay man into her home and raped him".
Forcing yourself onto others? Seriously. If you ever come across a similar person, please. Do the right deed and you can still change his/her life.
Why feel bad for Nami? she clearly knows he love someone else, so what's her reason if ever she get hurt and reject the outcome? It's her mistake to enter a relationship where their is clearly no love from the start. She's the one who wasted her time clinging onto someone who don't love her, instead of being open to other people who'll actually love her. Don gave her a chance, but alas it didn't work.