My girlfriend is not trustworthy

Hi there, I am in my late twenties dating this 25 year old beautiful lady for almost three years now. Her name is Samantha. Samantha was previously dating this guy called is Mike who turns out to be an acquaintance of mine from varsity. Samantha and Mike are both in the same mid-twenties age range and the live different cities. If there’s anything I can’t seem to forget about Samantha is that at the beginning of the relationship I threw a random question at her; about whether she had slept with anyone else while we are dating. Surprisingly, she honestly told me that she had once slept with Mike and that she was sorry. My response was cool, calm and collected as we were still at the beginning of the relationship anyway, not to mention the fact that Mike was her first and three year varsity boyfriend. Perhaps it was a genuine mistake. This year about four months ago i notice a sudden change in Samantha’s attitude. I confronted her and asked if she still wanted to be with me before she assured me that she still loves me and wants to be with me. A week later a was visiting Samantha over her at her apartment, and despite her assurance, I decided to go against the odds and dig up on her. I guess skeptism forced me to conduct a mini investigation on her. In her absence I viewed her cellphone call logs, messages and emails for any contact between her and Mike but couldn’t get anything. I managed to access her personal desktop computer just to found that she had exchanged nudity pictures with Mike a week ago, the same weekend she was distant. We eventually spoke about. Mike was notified that their friendship is best terminated. A few weeks later went to visit Samantha again at her apartment, just when I was about to leave she received a call which she ignored. I couldn’t help but ask who it was she did not want to speak to. She told me that it was Mike. My mood swung, I lost it and an argument broke out. I asked her call Mike instantly and establish why he was calling in the first place after we’ve after he was informed that it rather best if he stay away from Samantha. Anyway, I could hear Mike ask “why shouldn’t I call as if anything happened” At the same time I could also notice that Samantha was not speaking objectively. “Mike you’re on loudspeaker and I’m calling to find out why you were calling”. In anger I decided to speak to Mike personally. I grabbed the phone off Samantha and furiously asked Mike if he’d rather like me to give them space so that they could workout their relationship out but he got all defensive, angry and claimed that we should not muddle him up in our affairs before he hung up. This time around we were visiting Samantha’s family in the same city that Mike unfortunately also happens to live in. We were sleeping at 02H15 Sunday morning when Samantha’s phone rang and it was the same guy. I can only imagine that he’d gone out clubbing and thought why not make a “bootie call” if he is to gone home alone. Another argument…. I smashed Samantha’s MacBook deliberately and walked out. I have a feeling she informed him that she was around town. In conclusion, I have decide to convince myself that no matter how much I want this relationship to workout Samantha is just not serious. I have tried to end the relationship but she keeps coming at me. However until such time that I have found somebody decent and serious I am going to play along. I will just play cool use her. I have decided that from now on I will use protection as she is totally not trust worthy. As with Mike, I felt that he disrespected me when he told me that we should not muddle him up in our relationship. It seems like its okay for him to get me mixed up in his “game”?! I feel that he disrespected me because he knows what Samantha and I are dating yet he had the nerves to contact her to the extent that he even requested and accepted freaking nudity pictures from her. Mike, he is a skinny guy and there’s no way he can beat me. Hence wherever I see him, it is gonna be a big one - I am going to beat the shit out of him for all the pain he caused me. As for Samantha, she must be the dumbest person on earth to be thinking that she can contact Mike secretly and tell me in face that she never does. I think in the long-run she is gonna suffer. What I your opinion?

I don't how to edit my article and as a result it will go with its errors.