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but what i realise is i must have more power in this relationship.. should i just ignore her? how do i resolve this?
Power does NOT equal control.
based on what you wrote, it seems like you are being controlling. That will only push any girl farther away (and perhaps back into her EX's arms).
People don't own each other. You can't stop her from going back to a club. All you can do is hope that all the value building and relationship work you've done to make her happy keeps her from making mistakes. If you are an awesome dude that she adores, seeing her EX at a club may make her rethink the past a little, but most likely not act on it because she is happier now than then.
If however you are paranoid that she is going to leave you, or jealous of this ex, or any other insecure behaviors, she is most likely only tied to you with a thin thread. One easily broken anyway and certainly if she goes back to familiar turf. Face it, when shes promised you she wouldn't go back to a club it was her convincing herslef she was over it - but not actually. When she wanted to go back, it was her own test to see how she felt. The right move would have been to support her in it.
If she was going to cheat on you, she would do it anyway, what would the harm have been? Now you are just viewed as a controlling, jealous and angry person. You will most likely loose her unless you change your stance and be more supportive.
I'm not saying cower to her will, but I'm saying be strong and don't let it phase you. If she asks your opinion, state it clearly like a man. "I think you are only going back to test yourself around your ex". That is a fair statement. if she gets all defensive you knew you were right. If she see's your point she will respect you for it and most likely won't do things like that knowing you are right.
hope that helps.