Ok so ive been dating a girl for 2 months now.. and everything was good until i found out shes a slut?

so to start with im 18 and shes 16, ive had with one other girl, when we first started dating she told me she was a virgin, but as i sensed she was the type who wants an "expierienced" lover and i didnt buy that i told her i had been with 5 girls.. she a couple days later that she had only been with one guy, and altho pissed she lied was ok with that, it later turned into 3 guys and then 4.. all the while saying trust me im telling the truth i wouldnt lie to you, well the other day she told me its 10, and i dont buy it.. A im grossed out by this enormously, and B even more pissed that shes lied to me like this.. saying she wanted to wait until i got to know her.. like u ******* lied all the while saying trust me.. idk if my feeling this is justified or not.. i almost feel as tho i was cheated on.. even tho i wasnt.. however being that she lives an hour away im now worried that she will.. and she made me feel guilty when bringing it up.. what do you think?