First of all, you are not sneaky! Having been in a similar position myself, i found that once you have discovered the dishonesty of your OH, you do become suspicious at virtually every turn, because it's all to do with that small but very significant word, TRUST, in a relationship, and this has been abused ! I personally, would most definitely call the number for my own peace of mind, otherwise it would be niggling away for eternity. However, you may be one of those amazing women, who can turn a blind eye to his philandering ways and carry on with your life. I confronted my OH after 25 years of marriage, having been suspicious over a period of 18 months! I telephoned and invited his 'platonic friend' to discuss the matter one evening, which resulted in him leaving me and our 2 children for 8 months, but he returned. Unfortunately, however, our marriage only lasted another 4 years.
I forgave him, but just couldn't forget the lies and deceit which went before ? Good luck though with whatever decision you make, itll be the right one for you and, you will feel you are in control of your own life?