sad story !! i know it is so hard to get over this betrayal by your own wife,whom you trust so much. coming on dependent is very common in australia. almost 90% of girls/boys who arrived in last 3-4 yrs are on dependent visa (fake marriage).I live in australia and i know its a common practice..it only started few years ago initiated by all the agent in nepal for a greed.

Most of them dont' have any contacts with there so called husband live separetly and have a bf/gf n moved on..but its so hard to find a job here..n its not so eg some of them have a relationship n live together.

NO matter what when u trusted your wife so much n c betrayed u lied to u , if i was you i will not be able to trust her anymore.I will re-think of being with her,  i will just take this as a lesson ": "मुठ्ठी भरिको धन र नजर भरिको श्रीमती "  and not to make a same mistake again in life. Lately i have seen this problem so often here n back home its a scary thought to leave your wife alone for long.

husband baira wife ko nepal ma bf's haru moj masti..i am a frequent visitor to nepal n i cannot believe what goes behind the door

so i suggest you to take a bold decision and move on..dont' even bother  looking back n trying to patch up with her.once the trust is gone you cannot get it back.
Best thing is threaten her that' you going to send your marriage certificate to australian embassy else they both pay back your money.so you get your money back.
good luck..!!