Girlfriend has had sex with a few of her still close friends.

I found out today that my girlfriend is still friends with two people she has previously had sex with. We have been dating now for 8 months.

Two things I am trting to deal with understanding, any help is better than non. Thank

1.) I found out yesterday that her views on sex are different than my own. Not becuase I didn't raise the question, but because she lied to me saying that she has only ever had sex inside of relationships except once. (I personally view sex as inseperable from love). Turns out she lied to me about it at the beggining of our relationship thinking I wouldn't be with her if she told the truth. She has had sex with a handful of friends outside of relationships. I would not have cared at the time, and still do not. The thing i am worried about is the lieing. Relationships are build off trust.

2.) A few people that she has had sex with, turns out to be a really close friend of hers, and another friend that she only seems to hang out with alone, and makes little effort to introduce me to him. Again, i wouldn't have cared before the relationship started, but hidding something that sognificant makes me question the security an trust in our relationship. How would you feel under the following: (Your significant other has a friend that they only hang out with alone together. She does not make an effort for you two to meet. 8 months latter you find out on your own, that they have slept together... and she never disclosed this with you)

I trust that she is not cheating on me but... This lie and hiding information makes me question the security and trust in my relationship. Not sure what to do...

Thanks