I Feel Like Crap Because My Ex Cheated On Me

My ex cheated with his ex. Other than physical he ran to her every time we have problems. She would feed him bull crap and he also was very manipulative, he talked lies making it seem like hes unhappy or im the problem. He never showed signs or even told me he was unhappy he was always happy i did everything in my power to be the best gf. i put in alot more effort then he did. People noticed and told me im too good for him and he treats me bad but i ignored. Ive known him for 6 years i was his high school sweetheart his first girlfriend he ever had. I moved away we broke up almost 3 year later we get back together. I found out that he then told me he was heartbroken when moved but he went back and told all his gf's after me that i broke his heart made it seem like i bretrayed him to make himself look good. He cried to his gf after me told her im his first love and that i hurt him when i never hurted him intentionally. The same ex she was so nervous when i politely asked her have they been talking while him and i together she never gave answer but she said i checked up on him after i left him and he was broken over you. I was so confused she tried to throw me off , said she has a husband and a car and a ring something i dont have. I just ignored her she also said i dont have nothing on her no ring or car. Found out she is a stripper/prostitute and she was single she lied about being married. I left all the drama alone im so happy now. Maybe she is better why did she act that way?