When you are married, there are going to be times when the sexual intensity between the two of you waxes and wanes. This is very natural and it is in no way a situation that is unique to your marriage alone. There are times, however, that this lack of interest lasts for an extended time and you can feel your spouse pulling away both emotionally and physically. This can be a sign that there is a problem that must be addressed if you are to save your marriage. If you are a wife and feel that your husband has lost interest in you, you are going to need to confront this trouble head on, before you lose the man that you have committed your life to loving and caring for.
Most of the time, when a husband loses interest, it is not because of something that has happened between the two of you in a day. There has been trouble brewing for some time and you are going to need to get to the root of the problem in order to resolve it. Talk with him, in kindness, and ask him if something has been bothering him. It may have nothing at all to do with you. It may be that he is under stress that has come from something else entirely, such as finances. When this is the case, knowing what is going on with him will allow you to be his partner and helper, relieving him of carrying this burden alone.
There are times, however, that the trouble is directly related to the relationship between your husband and yourself. Have you become overly critical of him? If so, you are going to owe him an apology and to make the effort to change your behavior and words directed at him immediately. A critical wife can kill a marriage as fast as anything else. Men need to be complimented and encouraged, not shot down verbally. Have you let yourself go in the looks department? While you don't need to be a centerfold, you do need to accept the fact that men are visually stimulated and make an effort to look your best no matter your age or circumstance. Making an effort tells him that you care. Have you gotten so wrapped up in other things that you have forgotten to keep communication going and have neglected to do the things that you know he likes? If so, he is going to feel unimportant to you and this can cause a world of trouble in your marriage, both in and out of the bedroom.
If your husband has hit middle age, there is also a chance that he is dealing with some physical problems that are causing his seeming lack of interest in you. Gently, and I can't stress that word enough, ask him if there are changes that he is experiencing in his body. He may need to see a physician or begin to take some vitamins and supplements to get things on track again. This can be extremely difficult for men to accept and admit, so you will need to approach the subject with understanding and love. Never degrade him or tease him about these types of things. This can crush him entirely, in ways that are going to be incredibly difficult to repair.
When a husband loses interest in his wife, there is almost always a problem that has occurred which involves both of them. In rare cases, the man may be a philanderous scoundrel that you would be better off without in any case, but this is not often the situation. If your husband seems to have lost interest, you should make the effort to get to the root of the problem and figure out what happened so that you can find a solution, getting your marriage back on track and his attention back on you.