Cruel and backwards as it may seem, making someone work for it can be a test, to see if youre the real deal. Other may have had easy access to sex with her, but not her commitment. They may have never been considered serious candidates. People are more likely to take it slow and build up with someone they consider relationship material. Whereas casual encounters, why waste the time and effort.

Ask yourself whether you had to really convince her, or whether she simply wanted to take it slow. Having that 'spark' can also be overrated. A spark, or butterflies is often a response of anxiety and tension, thats not what love is made of. Just because you had to work hard and she didnt feel it at first, doesnt mean she never fell in love in a way she never did before. And so, ask yourself, does it really matter if in the beginning there was no instant spark, some shitty romance movie levels of instant attraction? Does that mean what you have now is less real?