I would encourage you to read up on how your brain is affected by the contact with these other men. Just Google "PEA infidelity brain chemicals" and there's plenty that you'll find. These things actually SHOW UP ON CAT SCANS, and withdrawal is a physiological event, not just an emotional one. Chemicals such as Phenylethylamine, Oxytocin, Pheromones and Serotonin. Not only will this give you a greater understanding of what you're going through, but it will also stress to you the urgency of the need to not have ANY contact with these men.
Each time you have contact -- even if it's just the returning of a text message or even just the READING, unreturned, of a text message, your physiological "clock" resets to 0:00:00 and your withdrawal period starts all over again!