I am sorry you are currently going through this, and thank you for sharing. As already mentioned, people change. We change in different ways over the years, and sometimes our relationships do not evolve as we do. Love is not something that you can force, and perhaps you just were not in love with your wife any more. You had mentioned that you met your current girlfriend while you were still married, so maybe the reason you experience this jealousy and feel the need to check her computer is because you are worried she'll meet someone while the two of you are together. You may have this inner fear now because you know it can happen. No one is the perfect person. You should have this conversation with your girlfriend and discuss your worries.