I can't stand when a married person complains, complains and complains, but puts little to no action behind the complaint. Such is the plight of the miserable married person and this may or may not be you. The miserable married person has a laundry list of complaints about their significant other. They use these complaints as a justification to cheat, and when you offer possible solutions to address the complaints, they always tell you why it won't work. They'd rather live a lie, instead of growing a pair and doing something deliberate to address their complaints. If this sounds like you, do us all a favor and make a friggin decision all ready!
Either file for divorce, be single again and continue your single lifestyle; or stay in your marriage, work on YOU and convert that negative energy into the positive energy of "repairing" and "restoring" your marriage. Be honest with yourself. What is your part in why you aren't getting what you need from your mate? If it's more sex, are you doing your part in making yourself appealing to your mate? Are you doing the things that they need, to make them want you sexually? Don't get me wrong, it's ok to vent frustrations, however it's not ok to practice deceit at the expense of yourself, your family and others. "Man-up" or "Woman-up" and put in the work, just like you do on your job in order to get that paycheck. You can't expect a satisfying withdrawal if you haven't made enough deposits. Keep the spark alive by checking in to see what can be improved on. Don't wait until everything's gone to hell before you implement marriage maintenance (which should be done regularly, even when things appear to be going well). People change and needs and wants change over time. This is the natural course of human life. If you've got a belly how can you require that your mate not have one? If you aren't taking your mate out, how can you be mad when they spend more time hanging out with their friends. When neglect is being given, be prepared to receive neglect in return.
If you have children, you must develop a trusted support system that can keep your children occasionally, so that you can spend quality, intimate time with your significant other. Stop being miserable and take control of your life and your situation. Everything isn't just going to magically get better, but if you just shut your mouth and start "doing", you can achieve what you want either alone or together. Misery loves company, but don't move in with it!