My daughter is peeing the bed?

I have a 6 year old daughter. It has pretty much always been just us. About a year ago i started a relationship and since then mt daughter has been wetting the bed. It seems to happen worse when the boyfriend stays the night or when we're at his house. I know there is no abuse there so im pretty sure its just her feeling threatened or something along those lines. My question is, do i end the relationship? Part of me says yes but then most of me says i can't allow a six year old dictate my life. I would love to hear from a child psycologist or someone in a related field. Thank you for your time.