spousal support

I am a military member (Male) in the state of Kansas, living in family housing with my 2 children, 15 and 9. My wife and I have been seperated for more than 3 months now. Our primary differences come from her "excessive" need to be out in the night life with pool leagues (3) and other must see friends outings. Out of foolish thinking or hopeful of reconciliation I chose to give my spouse $200.00 a month in support. and continue paying her car insurance as well as many other supportive gestures. She is a full time employed dental assistant and makes very good money to support herself. She has now moved into an apartment of her own and as expected has begun to charge many household items of comfort and necessity. As I said it has been 3 months since she walked out on my kids and me to never return except to have dinner or to pick up items as she needs them. That is usually only once a week, when it is convenient for her and no pool league has called for her. I have never been anything but hopefull that things could somehow work, but as she has stated, we are people of different values. Does she have a leg to stand on for custody and can I stop paying the spousal support money in this situation? The last thing I will say is that during a 4 month deployment to Kuwait, my neighbor will testify to the extent of my wifes outings and how much my children were at her house for mother loving care or outright left alone.