<human>: Can you condense the text into three sentences or less?

I will try to keep it as short as possible.

I'm having hard time right now, i have been with my gf for more than a year, but these last monthd have been very hard and painful. Last month she wanted to take a "break" because she was tired of being in a relationship, but later i found out she was just having feelings for another guy, who she admitted she likes him and is her crush.

 A few weeks later she came back to me and told me that she was wrong, that she was loosing more, i forgave her because i love her so much and i want to be with her. 

But his guy that she has been seeing is a guy from her class with whom she goes out, to ride bike to the park, to have lunch or dinner, to the movies, and to play to the coin machines, it really hurst me that she want to do all those stuff with that guy, i have told her that i dont like that, but she keeps doing it,(would all those things be considered date?) she even texts him to ask him if he wants to go to the movies or to have lunch.
 
But that is not all, i have found out that she has been texting strangers (using wechat), and not just like random stuff, she sends them selfies and pictures of herself, and the other way around too, it is not sexual stuff, but is flirting heavily(she doesnt even say that she has bf, and when they ask her, she denies it), whenever i grab her phone she gets so pissed at me and forcefully takes it away, she doesnt want meto check her phone or facebook, (am i wrong for checking all those?, im not trying to control her or anything, i just dont like her behaviour and how she has been acting lastly)

I feel like she just wants to play with me and just have me around to make her feel special, to make her feel safe. I feel so heartbroken for all this, i have told her that i dont like that she chats with strangers(all of them males), and to the other guy that she does all those things, she hasnt even introduced him to me.
<bot>: My gf flirts online and goes on dates another guy, how should i tell her to stop doing that?