Just found out my boyfriend had sex with his sister in the past. Should I break up with him?

I'm floored and weirded out and I just don't know what to do or how to feel. I was really paranoid last night and asked him if he was hiding anything from me. He said yes and I instantly believed he cheated so I pressed him to tell me what it is.

I didn't expect what came out of his mouth. He said that from when he was 14-18, he regularly had sex with his sister (who is a year younger). They're full biological siblings.

I love him but this just makes me see him differently. To even be capable of that... is he right in the head? Is this a major red flag? I can't even FATHOM sleeping with my brother (I just gagged typing it). And he did it for 4 years.

Please help.
Just found out my boyfriend had sex with his sister in the past. Should I break up with him?
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