Welcome to Just answer !
I am really sorry for all the emotioal pain and scarring that you have gone through , you certainly did not deserve this , as you have tried to give your 100 percent to the relationship , but unfortunately , the female concerned here had some ulterior motives behind her getting into the relationship , probably as things stand today she used this relationship to move up the ladder professionally ,and now that she has got no use of you , so she has very conveniently moved on to someone , who will now take care of her whims and fancies., and help her to elevate her status further.
It is really sad though , to see you mulling over the whole situation, but i will suggest that the sooner you realize that your relationship with her was conditional and she was opportunistic enough to take advantage of you , and get her way , it will be better for you .
You do seem to be Depressed ,as any one in your situation will be , and so i suggest that you may consider meeting with a Clinical psychologist , and get started on Psychotherapy ( couseling ) for treating Depression . The best psychotherapy for treating depression is Cognitive behavioural therapy ( CBT), it is a short duration therapy , held in a friendly , yet professional setting . I will suggest that you go ahead with it first , by consulting a clinical psychologist , , and i am quite sure that it will not only help you to treat your depression , but will also help you to come out of your much over relationship with that woman.
Also, i will like to advice that apart from going to therapy , try to focus your concentration on work , your hobbies, games and sports , all in all try to deviate your mind from her , and try to move on in your life , she certainly did not deserve you , and you certainly deserve a much better , loyal and dignified woman than she ever can become. And remeber that what she has done with you and is probably doing with some other man as of now , that is betraying one 's trust and loyalty which are the essence of any relationship , she may face the same tune in her future as well ,as they say as you sow as you reap.
So, i suggest that you try to get started on psychotherapy as soon as possible , and try to gather your self from the broken relationship , and think ahead to a new beginning in life , and please do not fall into the trap once again , if she tries to contact you again after a while and looks to give an apology to you and wants you to take her back in your life , please do not fall for this trap , as she has very well made her intentions very clear and from now on you should not trust her intentions.
I wish you all the best , and take care.. God bless..
I hope my answer serves your query according to your satisfaction.
Please press the ACCEPT button if you are satisfied with the answer as only then will i be credited for my service.