What should I do ???

Ew have been married for 7 years & recently I found out that she used to talk to a guy from the last 1.5 years..she says he was just a friend & somewhere I believe that she wouldn’t have crossed her lines but then I also have my doubts because if she can talk to that guy for hours together day & night then this change in her may have made her do many other things also… We had a big fight & she went to her parents home to stay for a month after that we decided to stay again & after 2 motnhs with me she’s again gone to her parents home from the last 1 month… She says I don’t behave normally with her & I ask her too many questions of her whereabouts..she meets me daily but talks very less ..she’s only complaining about how I did not treat her properly … I cannot accept the fact that she was talking to this guy & meeting him also..I love her very much & I can’t stay without her but at the same time I get angry when she doesnt tell me anything of what she’s doing.. I really don’t know what to do… I meassage her every hour but she never replies & if at all she does they are only one liners…