I Am Confused About My Relationship

Look bro, nobody likes to think about their partner with someone else let alone see it (except for swingers but thats not the case). Its normal to not like those images. But, she is with you now. By choice she is with you. Don’t punish her and yourself for her past from before you. She did nothing wrong. It doesn't matter why she did anything before starting with you. i used to be real jealous. At least at the time I thought I was jealous. Really I was insecure and scared. I was afraid I was not good enough for what ever reason. I ruined a lot of relationships because of it. If she is with you then you are good enough.
If you really love this girl you have to find a way to get pat this. I could try talking to her from the heart. Make sure you put your feelings on you though. Don’t let her think she did wrong at all. this might be hard given her past as you described it. You know her best so if you think even for a second she will blame herself then dI would not do it.
She is with you for a reason(s).Maybe you need to hear what they are. If you doubt them or her you are doomed. She is not going to lie to you but sometimes our fear has us lie to ourselves and blind us to the truth.
Oh and one other thing stay out of her phone.

She's an skank and she's not gonna change

You're just a rebound.