My Guy Best Friend is Giving me flirty Hints and I don't know what to do

I'm really good friends with this dude, he is an amazing Friend but I think he might be flirting with me. This is kinda a Problem because I'm a Lesbian, I like Woman and I thought it was obvious. He gets emotional easily and I don't wanna Make him More Depressed than he already is, idk how to Tell him nicely that I'm a lesbian, I really don't wanna hurt his feelings or Make our friendship awkward. What do I do? Should I just tell him that I'm gay?