Be there to listen to your friend. Sometimes, when a person is going through a rough spot in his or her marriage, the person just needs somebody who will listen to a rant. Be willing to sit and listen to your friend talk about his or her marriage without saying much in return.

If you have a good relationship with your friend's spouse, be willing to talk to the spouse if your friends wants you to do so. Sometimes an argument between a married couple can be solved by a good "go-between." It may be awkward for you to do this so make sure that you're comfortable before you talk with your friend's spouse.

Take your friend out for a night. A night with just the two of you can help alleviate the stress that your friend is feeling because of his marriage problems. It can also give the spouse some time without your friend, which may be needed.

Give your friend advice based upon your own personal relationship experiences. You don't necessarily have to be married to understand the problems that are going on with your friend's marriage. If a similar situation has happened to you before, give your friend advice about what the right and wrong things to say and do would be in this particular situation.

Be willing to spend some time with the couple. This isn't always appropriate if your friend is going through a particularly hard time right now. You'll have to gauge the situation before you know whether or not this is a good idea.

Tell your friend that everything is going to be alright. When your friend is going through marriage problems, a little reassurance can go a long way. Be there to lift your friend up when he is feeling down.

Be sensitive to your friend's needs during this time. This is the most important piece of advice. You need to be there for anything your friend needs when he or she is having marriage problems. Whether it's a phone call or a simple hug, be willing to do whatever it takes to help your friend out during this difficult time.