Other end of the stick

5 years ago my wife had a major affair and got pregnant. Through those 9 months i stuck around not knowing if the baby was mine, and the affair continued. Finally through all the emotional pain the baby comes and its mine thank god. Now im not perfect after that i got caught talking to somebody in i way that was wrong. But i stoped and tried to push forward. Now i started talking to the same person but it was completely platonic. So my wofe finds out and she is completely furious because i didn't tell her. She started looking through my phone and i stoped her, well now shes really furious. Ive talk to this person just as a friend and we would just vent to each other but no matter what i say im just getting called a liar. At this point i don't know what to do.