What do i do? family issues. any advice?

i have many many manyyy family issues and its been really bad for the past few months. my parents r in the process of a divorce and i live alone with my dad. i dont really see my mother or talk to her. they are not yet divorced but for the past month, my dad has been talking to this woman who is now his gf but she lives about 2 hrs away. i have been through so much trauma the past few months and have been deeply hurt and am in therapy for what ive been through but he continues to see this woman although i do not feel comfortable with him dating. he knows this but doesnt do anything even when i confront him. he left overnight to spend the night with her and its obvious what they were doing. i find it so disgusting. i know this sounds horrible but i have problems trusting anybosy in my life and became curious and checked his texts from her. she makes nasty/dirty comments and even talks badly about me (ive never met her) because i gave my dad a hard time about spendng the night with her. he even agreed with the comments. i honestly have noone to turn to in my life. he was the last person and i have lost him. in another text he asked if she wanted to run away with him because he was sick of all this crap. i feel so abandoned and uncared for:( im really depressed and sad all of the time. he also said hes in love with her even though theyve been talking for a month and have met 4 or 5 times,,,what do i do??? i dont even talk to my dad anymore because im so disgusted and hurt. he keeps yelling at me for having an attitude and tells me he doesnt need this ****. i cant deal with this anymore. this has just topped it off because ive already been through so much i just cant take anymore pain in my life. please help me. any advice?? im losing hope :(