I'm walking away after 3 years of saying I would

He's been lying to me since day 1 & now I feel like I had enough. He breaks my heart and plays it off as if it was a joke, I can't keep going anymore. I gave him home when he lost his job and was kicked out of his parent's house, I helped him with money and even paid to fix his stupid car & what I get in return is this.  I always felt afraid to even touch his phone cause I knew I would find something & I would hurt too much so I always put it off. Tired of finding things. But yesterday he left his phone by the kitchen counter & it was ringing like crazy from text messages so I opened it and saw this bitch sending him about 20 nudes. She prob doesn't even know he's got a gf & I feel sorry for her too. Ah I'm so lost, been crying all day, if I at least had this girl's body from the pic I could go out and find someone for some fun to get the jerk out of my mind but not even that I have. Miserable. Broken & really sad. Destroyed is the word.