Wife want's Divorce... Is there someone else?

Me and My wife are both dual Military with three girls. One together and the other two from previous Marriage with ex and old boyfriend on gef behalf. Anyhow she is deployed to Kuwait and ahs filed for divorce from there because I told her that I bought a motorcycle a week after she left for deployment and wrecked it not even a month later. Is that a legitimate reason for divorce? And then she adds to it that I'm not there for her emotionally whaen she feels she needs me most. I Love My wife and I dont want the divorce but she's determined and like I mentioned, she filed from Kuwait and I recieved the papers in the mail and filed my response. On top of that she willfully accepted orders to Hawaii without considering me or the effect it's going to have on the kids. I dont know what to think. Everytime we talk via email or on the phone, she ask me if I'm taking care of buisness as far as being gone by the time she returns in November. I staying in California. How will Custody work also?