How can I tell my boyfriend I no longer have feelings for him?

i just don't feel like being together with him anymore. i have fallen for another guy in my class. However if my current boyfriend finds out that i have fallen for another guy, he gets upset. he's an emotional guy and i'm afraid that he commits suicide. he is so protective and i'm fucking bored with his attitude towards me.

How can I tell my boyfriend I no longer have feelings for him?
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