Narrator's POV :

Dhruv - He loved his angel since long but never expressed thinking she deserves someone better than him. He always had a feeling that because Vihaan insulted Deepu, he got a chance to express his love.
Dhruv thinks Deepu accepted him out of circumstances. After hearing Vihaan's words he decided himself that Deepu does not deserve him with his insecurities and confusions.

To clear them and to test his love he went away from his angel.

To love someone you just need your heart but for marriage you should give a lifelong commitment that you will support your partner, no matter what. So what he did is justified in my view. He did not cheat her by hiding his doubts nor rubbed it on her face.

Deepshikha - She is a person who loves others happiness, when Dhruv broke up with her she did not stop him. When you love a person you will know what they are. She knows that her Dhruv will be back soon.

She decided to leave her own home to let Arjun- Souravi live happily and she too wanted to move on. Dwelling on past never helps instead its better to work today for bright future.

Souravi - All her life she missed her friends and has been protected by her brother. When she got married and came to her in-laws home all her dreams were fulfilled but she was not able to handle problems.

You will know more in remaining two chapters.

Regarding other characters I will update again if you want. Please comment if you need any clarifications.

Thank you