Do I have to pay alimony if my wife cheated

In theory, if you can prove that you have fault-grounds against your spouse that caused the breakdown of the marriage, that can prevent her from getting spousal support.  However, proving adultery is so difficult, as to be nearly impossible, unless you have pictures of them in bed together or the man she slept with will admit it under oath, or if she is pregnant by him.  But assuming you can prove it, she could still get spousal support under Virginia Code § 20-107.1 if she can show that it would be a "manifest injustice" to deny her the support. This answer is given in accordance with the laws of Virginia and may not be applicable in any other state.  It should not be construed as legal advice, as that would require a more thorough analysis of all of the facts involved in a specific case.  If you need further information or assistance, please feel free to contact my office for a consultation. Case results depend upon a variety of factors unique to each case. Case results do not guarantee or predict a similar result in any future case.