How do I tell my boyfriend I was raped?

I had an office party last week and I got really drunk. A male colleague of mine offered to take me to a cab, but I ended up at his place somehow. And I was raped. I confronted him, about this, but he swears that I was the one who came onto him. He even has another colleague of ours who was also in the cab that dropped us of saying that I wanted him to take me home with him, and I was trying to seduce him, which I have a hard time believing. She even has the receipt of the fare where we were dropped off. But I'm really unconvinced. I've been distant with my boyfriend since, how do I tell him I was raped?
How do I tell my boyfriend I was raped?
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