When you fall in love with someone are you ever able to fall out of love with that person?

Yes, it is quite possible.

If you are younger, say a teenager, then developing crushes is natural. When you're a teen, you're not in "love;" it's just a crush. After a while, you'll start to perhaps notice differences between you and the person who you like. These differences may be the thing that sets you apart. Or you might just lose interest in the person. But, yes, it is actually likely for a teenager to quickly fall in and out of love.

I have found that once you find a love interest in another person, even if the relationship breaks up there is always a place in your heart for them.