I know what you're saying. But, people do make stupid mistakes in life just like Mayank did.
Mayank truly has learnt a lesson here and started realizing his mistakes too. Having said that, its not easy to forget someone you had loved at one point of time so suddenly. I hope Mayank gets over this soon and both Mayank and Gunjan are able to move on with their lives.
I do hope that Charu mends her ways and realizes her mistakes too. If Charu doesn't improve in the future, it's really going to be a glum life for Mayank.