Over time, you will realize that to be happy with another person, you need to, first, don't need it.
Realize also that this someone you love (or think you love) and don't want anything with you, definitely not the "someone"of his life.
You learn to like you, care for you and especially like who also likes you.
The secret isn't chase butterflies ... gardening is that they come to you.
In the end, you will find not who you were looking for, but who was looking for you!