outside relationship within a relationship????

Ok so I know the title is kinda crazy lol. I am engaged to be married Sept. 9th of this year. When we first got together I told him that I was bisexual and wanted a gf. He says he doesn't care and that he thinks it's a good idea to keep me occupied. I must say he and I total opposites. He doesn't want to join or even watch. He just wants me to be able to explore my sexual side without cheating with another man. How do y'all feel about this? Do you think it would cause problems. And how can I find a gf? I'm shy and don't know how to approach women. Advice please!!!