Most Helpful Girl
Hmm I hate to say it and I'm not coming off as mean, but stop being in denial. Just move on honestly. One of two thing's why she is acting like that. One: She is just childish and trying to get back at you by using what you did as an excuse (not fair) or Two: she probably was already doing this before you even found out. Because what gf post this stuff knowing you can see her history. That being said why are you on tinder anyway? o_O Lol at least you were honest with her i give you that and admitted your faults :) she is full of shit though. If you two agreed to get together and you find her on any dating site that's suspect there. but i think you both should just see other people or just be single. Or you two can just put that aside and give it another shot. I wouldn't and plus you're still pretty young so you'll make a ton of mistakes, no biggie. But don't waste each other's time bro.
Most Helpful Guy
She's active on Tinder? Damn that's foul. Looks like it is breakup time.