Do you also have this syndrome like me?

So I always have this syndrome like having a crush on someone, and when he also shows the signs that he's interested on me too, my feelings for him just.. Gone. And I fall for the next guy. Is it normal? Hey before you say anything weird.. I didn't play with guys. When my feelings gone I just move on without confusing him or using him in any way. But yeah, is it normal if I like him, then he say he likes me too and suddenly I just feel nausea and the urge to vomit. This not happen only once, it has been numerous time already! I just wanna know if some of you also have been in my shoes and.. What do I do?
Do you also have this syndrome like me?
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