How to get over this? Nothing's working please answer. Words of encouragement?

Ok so when my ex gets mad he wont talk to that person for a long time, about 7 weeks ago he got mad at me and didn't talk until last week when I had to go to his house and demand answers, (didn't know why he was mad, we weren't arguing or anything) anyway long story short, skipping the inbetween stuff: I found out the reason he was upset, something silly, he basically broke up with me via text, said there was no one else. (I knew there was) he finally admitted there was someone else and he lost all feelings for me and he still cares but doesn't want to work things out because he likes this new girl. He wants to remain friends, we were suppose to hang out tonight, he cancelled and said it had to be tomorrow, I drive past and he's hanging out with her. I feel soo hurt, I'm sad, trying to convince myself that I can do better and it's his lost. I felt so betrayed when I saw her car there, because he started telling me that he does still have feelings for me and he doesn't know what he wants and he's confused. So I was thinking maybe there is a small chance for us. We had plans to hang out since Tuesday. I'm just so hurt. Why wouldn't he want to work on a year and a half relationship? We've know each other over 3 years, he's known her a couple months, only been talking 3 weeks. I did everything for him!! What to do? Should I just be strong and not go tomorrow even though I kind of want to see him? Should I just go and get answers?