Is it LOVE or Just an INFATUATION?

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I have a friend I think she have a problem especially in maintaining a relationship, she is pretty and court by a lot of guys but the problem she can't be with a guy for 3 months because with the span of time she is with her guy she eventually fall out to another guy. All her relationship turned out into nothing.I'm very confused because she seem to love her guy very much because she gives all her effort for the guy to be happy, but after few months she will eventually fall out of love. Is it LOVE or just an INFATUATION?