She is not in love with you. You are the one that has feelings for her. She is there for her convenience. Who else would had taken her back after cheating and all the drama?
Don't bother with the arguments. She will always turn it around in her favour. There is nothing for you to argue about. It is time for you to take action.
And btw, why did you propose to her? Not only she tried to cheat on you but she tried to do it with your friends.
How would you trust her if you marry her that she is not going to do it even with your own family? She obviously has no morals.
On the other hand, someone that is that manipulative do you trust them with your money and property? Can you imagine her as a wife having a common account with you? How would you feel if one day you discover that she was taking your hard earned money to make herself pretty so she can go and sleep around? Do you trust this woman to be the mother of your kids? Are you sure she won't turn your kids against you one day?
She is obviously not suitable to be your wife.
Don't get fooled by her efforts to keep the relationship going. The relationship is not good. The only purpose is satisfying is to keep her going with her controlling ways. Of course she would put some effort at some point to secure what she has. Who wouldn't? Do you know many people that can have their cake and eat it too not to want to extend their comfort?
You will do yourself a favour changing your number and deleting hers from your phone just in case you drank dial it. The more you stay in this situation the more it destroys you emotionally and makes you less able to have in the future a decent woman that will add to your life.
There are many girls out there that have the qualities to settle down with a man and make him happy. Don't waste your time on a dead end situation.
You might feel familiar with her and share memories but this is something that you can have with someone new.
Write a list of things that you think that she has and you like her. Just do it. Leave it for 10 min and go back and read it and ask yourself "can I find someone that has these qualities?". The answer is yes. And not only you will find those qualities but you can have less negative things as well.
Just make sure before you move on to the next gf you are completely over this woman. The next girl doesn't deserve to put up with hurt from your past. Also any baggage of this relationship will set bad foundations for the next one.
P.S. Make sure you take the ring back. Sell it and spend the cash on a nice vacation.
