I’ve found out that my friends crush doesn’t like her back, I feel like I should tell her but I’m scared she’ll be upset?

I learned from her crushes flatmate that he’s directly said he doesn’t like her. I feel like I should tell her, she’s been pining over this guy for months and I don’t want her to keep crushing on someone who I know doesn’t like her back. The problem is, she’s got quite bad self esteem issues and I don’t want her start doubting herself further. She kept telling me things like “it’s not as if he’d ever like me” and that he was “out of her league” and stuff like that, so I’m a bit scared that if I tell her it will make her reinforce those beliefs about herself?
I’ve found out that my friends crush doesn’t like her back, I feel like I should tell her but I’m scared she’ll be upset?
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