He invited his best girlfriend to his house and i think im leaving

We have a relationship almost 2 years ago. Since the first month we had a fight because i saw he was receiving many hearts and kisses from this girl. He explained is her best friend, but she is very particular. She is legally married and has 2 children. But in some moment left the husband bc she said he didnt satsified her sexually, then she had something with a woman, and now she is living with the husband. She says she is autistic. From what he told me i understand she is very liberal and im trying to know my boyfriend and understand if he is, but he supports everything she does. So ive always thibk that anything can happen between them since there are no limits. Even when i suspected, i had the guts to ask him if something happened between them in the past bc they know each other since long ago,and he confessed that yes but it didnt work. She is sending her message every minute 24 h all days. And i was mad and kinda accepted it bc he told me she had a crisis and was in hospital. But is not only her, he is always watching girls on instagram and also writing to them. He invited her to his home 2 years ago and we almost broke bc i got mad. Now i spent most of the time at his place and with 3 days in advance he told me she was coming for 3 days. When she arrived i felt bad vibes and even didnt say hello. I tried to be reasonable, i was kind and servicial to her. The first night i slept around 10 pm and this girl and my bf slept very late. I was still awake in bed with door ooen, he was in next room playing, and i saw her coming to his room i dont know what for, and also looking at my room to see if i was awake. Next day she took shower and i she opened the door i was in my room with my bf and im not sure what i saw if it was her in panties. In the night they both kept drinking and she laughing very loud until 3 am. Now she took pictures just her and my bf and post it everywhere with kisses and hearts tagging my bf and he actually approved in his profile.i tried not make a fight but i couldnt stand it anymore and i left him with him. If she would travel with her kids and family no problem. But this is too much for me, my bf sometimes ignores my messages and tells me he is busy, sometimes i go to his room when he is playing and sends me back, and then i see he is for her 24 h for any stupid message she may send. Plus this week we were taking breakfast and watching in his computer a show, he order me to change something and i touched the screen and he called me animal, he has also called me stupid and bitch. Im so tired of this and i dont see myself in a relationship with this girl in the middle. Currently i felt bad and drained for all the time and effort and money ive put, and to be even worse supposedly we wanted get together legally and we loat the dates bc of him.