This can be very useful at the beginning of a breakup . Later, when we accept and let go, we will be able to forgive and release any anger we had. But at the beginning it feels so good to say: "one day you are going to hate yourself for letting me go.
I think the point is that you are content in every aspect of life. Change isn't necessarily a bad or good thing, sometimes it happens and sometimes its needed. Regardless, be thankful for where you are at.