Is this too intense to get back at cheating girlfriend?

She's rly sensitive, ok, but I know she cheated. We've been together 7 months, just started getting serious. We've been having serious fights about her thinking I have been standing her up on dates that she assumed I knew about cuz we suggested possibly doing it a week before. But suddenly we just forgot about it. Then I wanted to hang out Wednesday and she blew me off to go **** some dude. So she suggested going out tonight. I'm gonna tell her to get all dolled up for me cuz I have a surprise for her. I'm gonna ask her if I can see the ceramic batman I gave her for her birthday, and pocket the iphone I gave her to use for instagram for her business. Then before we leave, i'm gonna smash the batman on the floor, tell her to go **** herself, and throw the little keychain she made for me at her and leave. This is the second time she cheated. She was very convincing when I called her out last time but then I found a hickey on her neck. This is the 2nd time she has made me feel like my soul is torn from my body from her cheating. Is this break up too much?

Added (1). edit: she doesn't know I know. But I think she thinks I may.

Well, first of all keep control of yourself. Never does any good to lose your cool. Don't do anything that you may regret and don't make a fool of yourself. Always remember to stay in control when it comes to girls.
Sensitive girls or girls who pretend to be sensitive as well as girls who are too possessive or suspicious always seem to be the ones that cheat and lie about it later, even if you have proof.
I would really break-up with her and then don't allow her to bait you afterward. Just stay away from her.
I can understand taking the phone back. Probably cost money and she doesn't deserve it.
Do not break anything though.
So yes, I would keep my cool and break-up, then avoid her.

Why were you stupid enough to take her back the first time? When someone cheats, that's the ultimate sign that they don't give a rat's *** about you. When you find out, it's over that day! Don't give her the chance to do it again, like you did. Why? Because they do it again, it's who they are.

Is it too harsh, probably not. She deserves much worse. What I would do, is have her get all dolled up and take her to an expensive restaurant. After the meal, but before dessert… Excuse yourself to go to the bathroom. Instead of going to the bathroom, go to your car and leave. When she figures out you left and starts blowing up your phone, tell her to call the guy she's been effing to come bail her out because you're done. Believe me, this will get the point across without breaking things or doing anything illegal.

Go for it. SHe's a cheating piece of sh**.

Uh. That sounds like you're a little kid throwing a temper tantrum. Grow up and break it off in a mature way. Ex: "Look, _____. I know you cheated. I can't deal with it anymore. I'm sorry."

If she is so sensitive why would she cheat on you? WHyw ould she like another guy if she is o snesitive about you?

Bruhhh don't EVER spit on somebody… And maybe the fights in the beginning were from a lack of communication. But hey do what you want.

No maybe spitting on her would help and adding some more insults but Yea no she definitely deserves it

I think that you should just leave her be and tell her your done.cause i'm sure its gonna hurt her alot more that your not gonna take her back and jus give her the silent treatment. She will hurt in the long run

Think carefully

Ok that's a little too much. You don't want to make a scene and then have it come back at you if she talks about it to other people. I think you should just say that you knows she's cheating (calmly not shouting) and give her back the key chain she gave you and then just leave. Don't do anything you might regret later on.

Just smack that ho around playa, then **** her best friend

Revenge makes you as bad as her… Grow a pair and either forgive her, or dump her…