Is it ok to let my boyfriend play Bingo, every week, with a married woman?

My boyfriend works closely with this married woman on a daily basis and now wants to play bingo with her every Thursday night. I can go with them if I don't have anything else going on. Which I usually am babysitting that night or I just can't afford to go. My boyfriend picks her up at her house and takes her home. Her husband is on 2nd shift. My relationship with my boyfriend is we both decided to live together in about 6 months from now.