First of all ritu, I see your side
but It is not true that Angad has no confidence in his love, he does..even more than himself--But in love people can't bear to see their love unhappy---and judging by Kripa's character--chances are less likely that she will be happy ditching Prithvi. Guilt is one thing that can surpass everything, Angad wouldn't be able to stand seeing his love ridden on guilt trip.
Secondly, It was Prithvi who stood by Kripa when she everyone turned their backs on her, she was left all alone, Prithvi was the only man who trusted her and supported her, he left his house for her, had equal contrubution in building up her career, he gave her the respect in his friendship--Angad is confident that Prithvi will make Kripa happy
Lastly, Angad has lost confidence in life--not himself or his love. He doesn't want to look ahead and see recycles of what had happend before with Kripa and him, their love will survive--but will time give them a chance?that's the question. Or rather than time--will kyph's vamps tolerate their love?
though seeing Angad in this state--it is heart-breaking..
lots of love
Soni