Looking For Closure

So, my ex girlfriend 6 months before the last week she had worked at another workplace. I had got weird vibes from her for a couple of weeks to maybe a month and a half (less touching, no sex for at least a month, communication, she chose to spend 4th of July with her mom after I pretty much begged her to come with me to my family's, She conveniently ran into her ex multiple times and deleted texts that she had with him, She had a male coworker sending her sex music and was messaging constantly while hiding it. I had feelings that she was hiding something). Then and I confronted her. She flipped, and told me to mind my own, that she can do what she wants, I do not control her, "it is what it is", to stop accusing her, and then she gave me my engagement ring back. I just wanted her to convey her feelings to me bad or good. We took a break for about 2 weeks and near the end one of her female coworkers messaged me about a guy she had supposedly cheated on me with. I knew this coworker because she regularly stopped in at the store I worked in and I had never asked her about my ex's work environment and friendships. My ex said that it was because the female coworker was mad at her because she was friends with the guy coworker that the female coworker liked. I made a choice to trust my girlfriend of close to 4 years and fiancée for 5 months for the time being. She asked me over the phone if i would wait for her. I told her no, and that is what people who are trying to decide whether their affair is going to turn into a relationship and if it didn't work than she would have me to fall back on. We tried working our relationship out. The first couple weeks I was still pretty insecure: if her coworker was trying to get back at her why lie when the truth has so much more power to tank the relationship. Plus, after trying to work it out I caught her quick switching apps when I came in the room, just to find out that she was on Facebook. Doing what I don't know. And she is the type that will never tell the truth. I know this now. That is a little background on why I got even more insecure. I am insecure, but I think I control it well. She is as well. I cannot talk to another girl without her saying its my new girl then playing it off as a joke.

So, lately I have started feeling the same vibes and signs. She has used Snapchat to contact the same ex from the carnival and lying about it, deleting conversations from the same ex on Facebook, and other conversations with best friends and family. I found a photo of her with no shirt, only thing you can see is the top half-inch of the breast area no areola or nipples. It was in deleted pics and she said she was just taking pictures. Then when I talk to her about the hiding the Snapchats and face her she says that I would get mad if I found out, that, nothing is going on is why she hid it.Which makes it more suspicious in my opinion. Also, she broke up with me after I told her i knew she was lying. For months, she has been mean, rude, and not herself. like she wanted me to break up with her.

What should I think? I just want closure and to see what you guys think? Please feel free to analyse me as well. I' believe myself smart. Females are my Rock until they break my leg and I need a crutch.