As of 2022, Amybeth Mcnulty does not seem to have a boyfriend.
She is probably single at the moment. Also, It appears that she recently broke up with her boyfriend Louis Hynes. Judging from their Instagram handle, the couple had been dating since around mid-2000. They were seen celebrating their first anniversary in May 2021.
However, following her Instagram stories where she hinted about being single, it is speculated that she might have broken up with her boyfriend.
Moreover, in June 2020, the actress opened up about being bisexual. Her fans of the book and the series had often speculated that she was bisexual as it always reflected on her intense friendship with the girl-next-door Diana Barry.