do you approve the fast love match?

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l'm a college student .in our campus there have a lot of lovers,they hug ,make fun each other and have a good time.of course,some of them learn tegether and encourge each other in study .others like us allawys focus on them with admiration,so it bring the fast love match,an exampe in point,one of my friends just talked with a stranger one hour ,after that they went out tegether.tomorrow they seemed lovers like others.what change has happened to them in one night,just one night.i can't think throught,what's wrong,and what views do you have? can you tell me?