Unexplainable valentine

You never know what is love.

I'm someone who prefer a healthy lifestyle,
But I once fall for someone who never took of her health.

I'm someone who work hard to achieve in academic,
But I once fall for someone who study last minute.

I'm someone who is seeking for one true love,
But I once fall for someone who never cares about that.

Of course, the relationship did not last.
But the love last forever.

Can you explain?