It's true you take yourself (and your problems) with you wherever you go, but relationships have a huge impact on quality of life. If you're not feeling love anymore, I think it's better to let the other person go - because then both of you have a chance to find someone who can love you better!
We're all worthy passion and excitement. It's okay to want that in our lives.
But I'm really sorry to hear about your break up. Break ups are so hard. I hope it opens up a space in your life so you can find someone who loves you better.