I respect your point of view but I would still reiterate that there is no love story without angst. I have seen American shows where the leads got together after 5 years that is in the sixth season so I know at least Misbir won't be apart from long. As happiness is a vital part of life so is sadness plus I always believe that such incidents make your love stronger for each other. There is no life and love without pain. That's the reality of real life relationships not everything is rainbows and roses. Everyone has dark days that makes us savor the good moments even more and even when the night is dark as Dumbledore from Harry potter said it's up to us to switch on the light. This is my personal POV I have been through a lot in life personally and that has made me realize that giving up on hope is the worst thing a person can do to themselves. Things do get better and nothing worthwhile ever comes easy.
P.S don't put characters on a pedestal Abir and Misthi are human beings after all they will make mistakes we all do. Also take care and good luck with your studies.