What do I do not to lose him?

Okay I assume its an Australian thing to "show" yourself to another guy which means you cheated right? Because to my American ears it sounds like you are an exhibitionist in a raincoat that exposed yourself. But you know, either way, it sounds like your in roughly the same predicament.

You did something inappropriate with some other guy and now the love of your life doesn't want you.

1. Figure out specifically what was missing in you that made you trash it with the "perfect everything you wanted" guy. If you felt neglected and lonely, well there you go. What do you need to feel NOT neglected and lonely? Is it really his computer time that put you "under a lot of stress" and so much "confusion of your life" that you betrayed your true love, broke his heart, made you throw away the trust of your partner? Okay.

2. Whatever it was, and I'm just saying, it might be more than him being a homebody computer geek, deal with that. So that its gone from you. Whatever you were trying to feel by "showing" yourself, you have to be able to feel without "showing" yourself. Then, you are safe for him to be with again. Otherwise your the same broken person who he is wise to stay away from.

3. Explain and explain to your guy what you have learned, what you have done to change, why you know it was wrong. Don't make a single excuse (like, "If you just didn't use the computer, then I wouldn't have shown myself") That's not going to work for him. Rather, "I took you for granted and thought I needed the attention I get from showing myself. But now I know that I only want to show myself to you, baby! " Maybe he'll listen.

If he listens, and you've truly changed and learned and can present yourself to him as his true love that will never go out "showing" while he's busy browsing the web, you have a shot. Maybe. Then if he comes back, expect him to be suspicious and need consistency and time to heal. And if you get anywhere close to "showing" yourself again, you're back to square one. But if you really did change, that won't happen right?

But he might not come back. That means you blew it. So still figure out the same thing, except apply your new knowledge to the next guy when you move on.

And if he does come back, make sure he doesn't "punish" you for what you did. He can be insecure, because you've been untrustworthy. But he should never be hurtful to you once he returns. Even raincoat wearing exhibitionists don't deserve that.