This may not be what you're looking for, but I've fallen in love with my boyfriend more than once. When I first got together with him we were graduating high school and I developed an awful anxiety disorder at the fact that everything was changing. I became so codependent on him that our love, while still strong and definitely real, was more like a necessity. I was terrified at the prospect of losing him, terrified of what I would do if he ever left me, etc. I loved him desperately and anxiously and realized I was loving the fact that I had him rather than him.
Then I went and got help with my anxiety and am worlds better than I ever was before and the love we share now is just so easy; it's like a completely new relationship. Rather than clinging to him like a lifeline I am able to be my own person and appreciate everything he brings to my life. We've been together for almost a year and a half now and the love we have now is so different than it was. I know that as we continue to grow as people, our love will continue to change.