Jealousy can be a huge issue in a relationship, especially if you have had troubles in the past with cheating boyfriends or if you have low self-esteem.
I feel that if a relationship is solid, open, and strong, that you should feel confident that neither person would cheat which is why I think it's fine to have friends of the opposite sex - that's if your partner doesn't mind!
What do you think? Are you OK with your guy having female friends? Does it depend who the girls are? Are you cool with them talking on the phone? Emailing? Getting a drink together? Or do you believe that guys and girls can't be friends?