Should I leave?

I started seeing this guy and I thought everything was going good. I found out that he was expecting a baby pretty soon. Like in 2 months soon. He kept a secret and even told me on a vacation trip with his family before I knew. The tricky part is he recently got the news he has stage 4 cancer (odds of survival are not great) and I feel like a terrible person if I walk away. I feel so blindsided and his excuse was he didn’t want me to feel pressure.

Should I leave?
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