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but I really like this one and want to share my life with her
Urg... You don't even know her. Why to do people think like this about certain girls that they haven't even had sex with? Probably a lack of options probably. You want to make her monogamous when she is obviously poly?
This isn't even LMR. LMR is problems in the bedroom before it happens.
Your problem is that you're compromising on shit dynamics. You just give all your power to her if you reward this behaviour.
Stop going to parties, take her for a ONE ON ONE (private) drink and then escalate and lead to your apartment so you can get more than a makeout. If she declines a private drink, then you're wasting your time