What's the deal, Lucille?

So been in a relationship 15 months to someone I met on road. I travel for work but in May and June I was gone back home then had to work another project away from her. When we first met she was "hanging" with one guy, just got out of an engagement but he was still around and other men were interested. She supposedly stop talking to the ex, told the "friend" she was no longer interested and I had to confront the others to stop contacting. Since May she has put a security log-in on her phone, has her volume always turned down, will not answer calls in front of me, went out with a "friend" three times in a week but never when I am around, will not (and I yet too) introduce me to her parents but the ex lives next door and she visits often, asked one of the guys I confronted to come back to her work (bartender) to visit, lied about another guy and he having her phone number and now becoming friends with her ex on Facebook (excuse being her dad is in the hospital and he wanted updates since they are neighbors). WHAT SHOULD I DO? Thank you!