Friend and marriage dilemma!?

Wife doesn't believe that two people (man/woman) can just be friends. I had female friends (platonic) that she was jealous of and stopped talking to them because of my wifes insecurities. My question is this: Would you hide a friendship from your spouse to avoid conflict? There is an old friend (ex co-worker) I want to see (female) and I know my wife would make a big deal out it if I told her about it. What should I do?