Wife Talking to Another Man -- Please Help

Thanks for listening to me. I've been going through a lot over the past month and I feel like I need some advice. Right before Christmas I noticed my wife had become disconnected and was extremely attracted to her phone. I randomly looked through her phone one night and saw her texting with another man -- they were talking about having a life together and she was making comments about not wanting to hurt me. I immediately called her on it and she just got pissed at me. Over the past 4 weeks she has told me that she doesn't want to lose me and that she still loves me. However, I also noticed that they keep texting/talking even though she assures me that it is over between them and that they do not talk anymore. When I try to talk to her she just gets mad and tells me to stop snooping through her phone and that I will never be able to trust her again. I have to admit it will take some time for me to trust her again (but it is something that I would be willing to do) but she has to stop talking to this guy. We have a ten month old daughter and our marriage has been been put to the test. We have only been married for just over two years but we have been through enough stress to last a lifetime. I feel heartbroken, confused and lost right now. I wish I knew what to do. I want to save my marriage but I know that if she can't stop talking to another man for me then I might need to move on. Thoughts/suggestions?

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