I can't get over my ex. Please help!?

I am a 18 year old girl and ive been dating this guy for close to a year. Usually in relationships I'm the one with the upper hand, and I try my hardest not to fall in love so I don't get hurt, I know this is wrong but with this relationship it was different. I fell head over heels for this guy and I thought he felt the same way. Everything seemed fine up until earlier this year when he stopped telling me how he felt about me. He would only say I love you if i said it first, at the time it upset me but i just thought hes a guy, he doesnt like to show emotion. Two weeks ago we got into a little fight because he decided to hang out with these girls i don't like over me. Normally, I wouldn't care but i felt insecure because he never let me know in anyway he loved me. he got angry at me, but the next day he was fine with me and acting like normal around me. two days later we hung out and everything was fine and he was flirting with me and stuff, but then he, out of the blue, told me he thought it would be better if we were just friends. I asked why and he's like oh because of what happened and you're always insecure. For me, it felt like i had been betrayed because he acted completely normal until the end, and i feel like that is making it harder for me to deal. He has also been texting me every day since and having normal conversations with me, as if we were still together. I'm not sure what to do because i still love him and i feel decieved and confused and upset and angry at the same time. How do I a.) get him back or b.) get over him.