Never speak badly of him to anyone. Sometimes we wives have a tendency to want to "unload" with our sisters. We like to "share" or have girl talk. There is a point when you betray the trust of your beloved.
The most simple test is this....
Are you sharing something that is negative about him? If so, shut your mouth or think of something nice to say. You know that saying... If you don't have anything nice to say, then don't say it. How much more should it apply to marriage.
Are you sharing something that you would be offended or feel betrayed that he shared it with his friends? If so, again, shut your mouth. Wanting to have "sharing" time is no excuse to sin and betray trust.
Never EVER tale-bear about your husband!! God forbid we have a false witness about the very one we love!!
Pray for him daily in specific ways. Pray his name be respected by others. Likewise, show him respect as scripture COMMANDS of you. These are just a few things, but they have stayed with me a long time. They have served exceedingly well in our marriage. I would recommend them for anyone who is married.