HELP PLEASE! I think my sister is a lesbian, what should I do?

Anonymous
Hi, so me and my sister are not that close. I mean, we don't talk about our personal lives but when it comes to defending each other we get really protective.
I don't know why she won't talk to me, maybe it's my fault but I really wanna know more about her life!
I have a feeling she is a lesbian. It's not only because she has never had a boyfriend, but she like remembers like the hairdressers' (female) faces and comments on it. and sometimes she just makes really weird comments that just make me uncomfortable and then I say stuff like "you're so weird" and then she gets really mad and mean, which I get.
And on the other day, she borrowed me her pc and I "accidentely" read a convo between her friend (girl) and she said stuff like "couple goals" for their relationship/friendship and they call each "side hoe" and stuff.
I really don't know what to think, it sort of freaks me out. But I just wanna be there for her and support...
What should I do?
HELP PLEASE! I think my sister is a lesbian, what should I do?
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