Katielee...I don't know. I read your post and all the wise replies here. I can say I've been in your shoes, wondering if it was all ME!??? Is he online with other females, receiving calls from females, and denying it or hiding it? Or do you think this is just your own fear and paranoia? If it is just you, then I agree with the others here, that maybe you need to do some self-work, or therapy.
In the end, all we can control is our own responses...not what the other people in our lives choose to do. Reading Habit 1 of THE SEVEN HABITS OF HIGHLY EFFECTIVE PEOPLE really helped me to deal with this. I am going to PM you.
Patty