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I've said some really nasty things to her now calling her a cheating slut and told her how much I hate her. I need some help here guys. What should I do?

With no actual evidence, you already went and called her a cheating slut? Are you sure this is your girlfriend and you love her? Because trust is an extremely important aspect of love. If you suspect the girl just because she installed Tinder and she spoke to a guy, your relationship is doomed anyway.
Let's see what she did that was wrong:
- She installed a dating/hook-up app on her phone.
- She messaged another guy behind his back.
- She's hiding something because she won't let him see what's up.
Do you honestly expect a guy worth his salt to still trust his girlfriend and that she may or may not have cheated on him? She probably lied somewhere down the line more than once on something
OP might be a little insecure/jealous/controlling but there's a reason for that. You just don't do shit randomly for no reason, there has to be a reason why OP is getting on this way. Sure, it's not ideal and very unhealthy, but GF acting shady trumps OP's insecurity 100% of the time in terms of severity for being in the wrong