So confused

I don't know what to do... someone give me some incite! Okay I should explain the dilemma, my other half has been doing something all summer that I totally do not approve of and am entirely threatened by which makes me mad that it makes me so insecure cause I am a secure person and I trust sometimes way too easily. He's been doing this, we'll call it "camming", for at least three months that I know of and the only reason I ever found out was by chance although of course he thought I was snooping but I tell you all right now I do not snoop I think being oblivious is sometimes the best thing ever but since I accidentally uncovered his secret and confronted him with it I've been so insecure that I have caught myself questioning his every action, move and word. He's lied and has continued to lie to me on a regular basis and he thinks I'm dumb enough to fall for it, I have to give him some credit he has told me about "camming" when I confronted him but only the truth that he wanted to tell not all of it. It pisses me off so much that he does that, how can we have a stable commited relationship if he lies?? How can I ever trust him totally if I know that he's lying but am too chicken to confront him on it?? ARGH!

So I'm at a loss as to what to do, the "camming" had stopped for awhile when he held true to his word for once and told me all about what was going on and that he was waiting to find out the verdict before he went forward with it, but now he's found out that he benefits and he wants to do it and I don't want him to. I know I'm wrong on not letting him do what he wants but I hate it I hate the way it makes me feel I hate the insecurity and the lying and the discovering information by seeing him doing something while he claims he's somewhere else and it makes me so mad but mostly it makes me so sad and depressed and down on myself and just overall like s**t.... isn't the person who is supposed to love me with all his heart supposed to want to make me happy? Isn't he supposed to sacrifice things for me like I do for him? So anyway he says he won't do it cause theres no point in doing it cause it makes me unhappy but I can tell in the tone in his voice that he's pissed off about it and that in the end what he's going to end up doing is doing it anyway and lying even more and covering himself up even more and pulling away even more... I am so lost... I am so hurt... I am so UNHAPPY.... I think that sometimes maybe we should end things, maybe the compromises are too much for both of us, maybe he deserves someone else who will put up with this crap and maybe I deserve someone better than him. I love him so much and I really and honestly, deep down never want to let him go but I want him to stop "camming" I'll do anything to make him stop. *sigh* Vent session over. If anybody ever reads this I welcome any help you have to give.