Be it in reality or fiction, we all have different views regarding this concept. To some. first love is a magical memory that they find hard to move on from. To others, it's an experience that helps you discover that what you're looking for is not a first or second or third, but a love that lasts.
It's not necessary that your first love can never be your true love, but most of the times, people get too caught up in this illusion to realize that. Love is just love. It doesn't matter if it's the first or the last. What matters is that it's REAL and with the right person!
Personally I feel that the concept of first love is severely misused and overrated, especially in the world of fiction. It is not all it's hyped up to be. People have created these visions in their minds regarding how eternal first love is simply because it happened first. Whereas most of the time, people are just so high and exhilarated to experience something intimate with the opposite sex that their mind conjures up false interpretations of what might merely be an infatuation. That attraction is more towards the idea of love than love itself. This is the main reason why people get so heartbroken when that first love inevitably ends. Because when the initial high of being with someone begins to wear off, you realize that your expectations were far more than what you actually experienced.
Swara is going through something similar. She experienced new feelings with Lakshya, feelings she named love, and that might have been the case at that time, but things are different now, she is different now. Then came Sanskar, a person who wronged her in the past, but who ultimately became the only man in her life she could count on. A man who redeemed himself to the point where his happiness doesn't even matter to him anymore, as long as Swara gets hers. Whether she realizes it or not, fact of the matter is that Sanskar has managed to get under her skin. Where initially his declaration of love towards her freaked her out, she seems to have accepted his feelings, even if she doesn't reciprocate them as of now.
She's at a crossroads where she has to choose one path, the right path, that will mark the start of a new journey, a new beginning in her life. One path is old, a path she's walked on before, and the other is new which naturally scares her. But just because Lakshya was her first love doesn't mean she's supposed to choose him by default. Her future, her happiness, everything is at stake. She's been hurt once, badly, and is scared to acknowledge her growing feelings towards Sanskar. There is no doubt in my mind that she is completely over Lakshya, because if she wasn't, she wouldn't so vehemently deny his proposals repeatedly.
Sometimes the best things in life come out of the worst situations. When Swara was at the worst point of her life, she found support in the form of Sanskar, a guy who has now become her best friend. A guy who wants her to take the ultimate leap of faith, in him and his love. To give love another chance, with the right person this time. Choosing this new path for her might not be easy, but one thing is clear, if that path leads her to a man like Sanskar, it's going to be worth it.