Being married and having a friend who is a woman will not mix well for most. If the friend is a friend of both of you and all communication is in the open with full knowlege of your spouse it is one thing but to have a relationship = even a platonic one- is a bad idea. Your SO will have a problem with that and it will not be good. Don't text her, don't call her and certainly do not see her without the SO being part of it.
