How do I break up with someone?

Okay so I've been dating this very sweet guy for 5 months now but I feel the need to break up with him because I haven't really wanted to be in a relationship. It's hard for me to be dating a guy (I'm bi) and I've only ever dated one girl. I have a fear of men from a when I had to deal with my biological father who did unthinkable things to me when I was younger. Now, I know my boyfriend wouldn't do that to me but I still have the immense fear and I simply just think a relationship isn't the best for me at the moment. He's also a pretty depressed guy and I'm scared that if I break up with him, he'll do something irrational.

How do I break up with someone?
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