Boyfriend???

I assume she's dating Colton. A lot of photos of her and Arsenal.

www.jrichardsingleton.blogspot.com

Rumors that Colton is gay.

She is Colton's beard

Yup, and he's pretty open about them being together on social media.

When asked, she always says she's single. Her and Colton Haynes are just good friends. I have no idea about his sexual orientation.

"Time is the fire in which we burn."

It wouldn't be that surprising if she is single and maybe just dating casually.
She is essentially the lead actress on Arrow now which must involve a pretty demanding workload.
Also she is only 24 and probably wants to focus on her career at this point.

Yeah that sounds reasonable. She seems to be very sensible and handling herself really well.

It is possible that EBR and Yvonne Strahovski both have very close relationships with gay men.