dont know where to leave msg for you, so i have to put it here. 

Thank you. And in fact I am just 20 years old, so maybe my opinion of love sounds immature for you, cause, yeah, I don't have many experiences on this, and maybe I would change my thoughts after years, who knows, ha. About the differences between infatuation and love. Actually I didn't even know the word Infatuation until I checked dictionary, ha, okay, poor English.
Eh, here is my opinion, okay, infatuation, a strong feeling of love or passion for someone that makes you unable to think clearly or sensibly. Being infatuated with a woman, means you like her and would like to own her, since it's an infatuation, means she has no responses for you. I think what you mean about heartache is because of this. As mentioned before, infatuation makes you unable to think sensibly, so you can't see her defects, and maybe even her defects look beautiful in your eyes. Here are two ways to do with this situation. One, try your best to know her more, in my view, no one is perfect, with days passing by, I think you would not feel so crushed on her anymore. But if you still do, okay, then maybe she is really so good for your taste. Now we try way two, make her happy, yeah, do something good for her, able to do something for your crush is always a happy thing, isn't it? Maybe sometimes you would feel unfair and heartache, think like this, if she doesn't like you but stays with you, isn't it a tragedy for you two, how can your life be happy in this case, and trust me, it won't take so long to find another infatuation, this is just a human being thing, endless chemical reactions.
Now, love, mutual infatuation makes love, compared with infatuation, love requires responsibility and loyalty. Love is a serious case, in China, we don't say I love you to someone casually, cause as long as you think this relationship as love, you live not only for yourself anymore, no matter what you do you should think about your partner.
All in all, infatuation is just a feeling, but love is life.
I mentioned 'love is a feeling' in my essay, that love is a kind of generalized wording, yeah, not sure if you know what I mean, cause you refered infatuation this word so I have to explain like this. Eh, kinda confused, wish you could get it.
Hey, don't laugh at me ok, I am still too young, ha.