Reba McEntire opened up on her marriage to ex-husband Narvel Blackstock during her Friday, March 1, appearance on The Drew Barrymore Show. Blackstock is a famous producer and manager who was married to the country star from 1989 until they called it quits in 2015. Due to the fact that they were in overlapping lines of work, the “Consider Me Gone” singer admitted their relationship was “a situation that was always business.” “I think it works for some people. They can be married or have a relationship and work together,” she explained. “Our work was all the time.” “Our marriage was 26 years. We…