Is it normal to like/love forever?

The title may throw you for a loop, but it's more complicated than it sounds.

I like/love the people who I like/love forever. At least, it's been the case so far, I've yet to live forever so I can't really say for sure. However, I am noticing that my feelings never go away....

Example #1: 3rd grade I fell for the new kid who came to school, he was sweet (cute) and he was nice to me. I was an outcast and nobody liked me so it was amazing to have a new friend. We were the absolute best friends, until the summer before middle school. Once middle school started he changed and we grew apart rather quickly (immediately). Even though I'm still 'angry' that he became such a jerk and decided he was too cool to hang around me anymore and we became part of two different social groups; I know that if he ever came to me I would still be there for him....

Example #2: Everyone has that crush on that 'older guy'. You know, that one who was older than you and was just a nice person, who you looked up to and admired. I had the biggest crush on him for years, and then he went off to college. (Let it be known he was there for me during a VERY rough part of my life and helped me get out of a bad situation). I still get those butterflies when I think of him (it has now been several years since that part of my life).

Example #3: It was just a crush... My best friends were started to get interested in each other. I liked the guy too though -- me and my friend seem to have the same taste in guys. They were (and still are) each other's first boyfriend/girlfriend. Something very small (emotional, but there was attraction) happened between me and the guy. While he was able to move on and concentrate on her and be devoted to her, I was left to my sadness, wanting to be with him and (I truly think this, I've had plenty of time to really analyze it, trust me) loving him unreciprocated. Believe me, I'm very happy for them, but I still find myself almost crying when I see how much they love each other.

Final, Example #4: My boyfriend and I are on a break, and I think it's leading to break up (we're still friends and stuff, though), but I know part of me will be waiting for him for a long time...

Those are just the most relevant (not to say there's really many more, just that they're not concerns of "like/love").