Is she flirting with me?

So, I told my friend of 5 years now that I liked her for 3 years. I went through it with her last two boyfriends and listened to her love life and I never told her I liked her until recently. Ever since I told her I liked her, she and I have been talking a lot more and she’s sending me flirty messages and asking me to link up so we can do sexual stuff together. The confusing part is, she has a boyfriend, but her boyfriend doesn’t think her hooking up with a girl is considered cheating (she told me this). What do you guys think she’s trying to do? Do you think she’s trying to flirt with me or flirt with me because I like her?
Is she flirting with me?
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