In this era loving the same gender are not really acknowledged, perhaps you're confused. Yelana is your friend but she's always protective around you, always standing behind you, towering over the men that tries to talk to you. One time a guy was definitely flirting with you but you have no attraction to him so his presence made you uncomfortable. Yelena picked up on this.

"Can you leave my girl alone?" She spoke with a warning towards the boy as she towers over him.