What Should I Do About This Sixteen Year Old?

My age is twenty-six.
I been living with a sixteen year old girl (Angela), for over an year and three months. angela has lived an unfortunate lifestyle.Both parents abuse drugs and alcohol. My guess is that angela must had gotten molested by her father and as a result her mother asked me to take angela away. angela attends school as a junior. I haven’t heard from angela’ mother in over an year. At first the mother would call.

I noticed when I first started living with angela, she was a beautiful girl and nothing more. A couple of months ago, angela started acting strange. I been trying to avoid hanging out with her so she wouldn’t get interested on me. I like her but would never want to take advantage of her or even try to harm her. I stsarted to think a lot about her. I decided to avoid being alone with her.
Alternatively, I started dating a girl. When I introduced angela to my girlfriend, my girlfriend comment to her “you have beautiful blue eyes” as a result angela ran into her bedroom.
angela has given me the silent treatment. refuses to eat , the only thing angela has said to me is “it hurts a lot, do you like your girlfriend a lot?”

Angela probably likes meme in a totally harmless way, and simply sees no harm or inappropriateness about what she’s doing, she might be sexually interested in me.

Either way, I don’t want to harm her. She has no where to go or take care of her. Is been over a week without communicating with angela. how disappointed could she be…. what am I to do with her?