I Just Dont Understand..

a few months ago i found out my girlfriend of 2 1/2 years had cheated on me so obviously i broke up with her. i think about her from time to time but i believe thats only because i do still care about her. since that break up its been hard for me to trust or even see myself with anyone else even tho i know i could treat the girls that i met with love and respect. recently i met this girl and i thought she might be the one that i could finally trust and feel comfortable with. we hung out a few times and i thought we were getting closer and that things were going great. i even met her family and went on a double date with her friend.. but recently it seems like shes avoiding me and doesnt wanna hang out or see me. i dont understand why.. the last time we hung out things were goin great everything thats happening now is just out of the blue. i dont know if i should keep reaching out to her and see if she wants to spend time together or just give up. i want your opinion what should i do?