All I can say to you is that the writing is on the wall.You dont need to ask us what to do,you already know what you have to do.
There is point being in a relationship where you are unhappy,have you heard that saying "You can comb a dog,bath it but a dog still remains a dog"
If she is triffling now she will always be,I just pray you realise this before its too late and thats falling in love and you know who will be the FOOL then.She will walk all over you like an OLD RUG.
Kiss her ass to the CURB,ladies are looking for a good man these days and yours has you but she refuses to see it.And besides she is greedy,wants to have all the fun while you stay at home.
Let her know this fact,guys to sleep with are very very plentiful but a guy that will be with you through thick and thin.Through the hard times and lead to marriage well these are a Dime a Dozen. By the way Men are scarce these days oh,at a time dem scarce like KEROSINE

Hi There
  I think its nice what you are trying to do,we all dont have to wait for the oil firms to employ us.We can go about doing little for ourselves.
  As you know economical situtation of Nigeria is pretty tight as ever and every one wants to drive a big car,live in a nice house without working too much.
  One idea for such people and I think would interest you pretty well is investing in the FOREX trade.I know what you are saying its kind of like a gamble but thats if you are not invested with the right people and have proper documentation.
  Being that you have been out of the country for a while you will find lots of factors which would be quite frustrating.All you need do is ask a family member to look into it for you say a brother or sister.Its quite common these days.Ask them to look for a reliable investor you can invest with and make sure they are not cooks,you know YAHOO YAHOO boys.Go on ahead by preparing a well detailed agreement with your investor and you are set.You can also go as far as going to the police station to sign papers saying that you both are into a financial understanding and also providing them with personal datas of himself.so incase he is a fraudlent person he would think twice before making any wrong moves.
  Good Traders offer their investors a minimum of say 30% return of their capital every month and 100% return after 3 months.So do the math 30% for one month for 10000 pounds thats 3000 pounds.Isnt that easy or what and for 3 months you get 10000 pounds.Sounds too good to be true but it is TRUE.
   This is one business you can successfully enjoy without breaking a sweat as long as you trader meets his payments.But like I said with all business come risks the only risk here which you can avoid is meeting a reliable and honest trader.And before I forget you can collect your investment capital anytime you desire which means after your service you still have your 10000 pounds + interest and can fly back to the UK.One part about forex that is also nice is that if your trader makes or does not make any profit(bad trade) that month its non of your business you still get paid your interest.
  You will probably be asking your self am I myself into this,well the answer to that is Yes I am but as an Investor and its pay divends.
  Just think about it.