Was I treated poorly? More information in comments.

I think you're treating yourself poorly by not letting this " douchbag" go. When you get older you'll learn  that YOU teach people how to treat you . Don't accept less than you deserve... Cos I said so ;)

No

We were together for a year. I messed up a lot in the beginning because I was afraid to let him. I had relationship issues to do my dad leaving when I was 10. I finally let him in and ended up depending on him for a lot. He was my everything. Towards the end of our relationship he started choosing his friends over me. He would lie to me about this one girl that continuously texted him from work. She would say things like "Why don't we hang out outside of work?" He always said he never answered but I dont know if I could exactly believe him. He lied to me about him drinking and smoking weed even though he knew it didnt bother me that he did it. He also started hiding his phone from me. My sister is friends with him so she would take his phone and look through it because I never did it. She found screenshots of other girls all throughout his pictures. They were from the girls instagrams. He always complained about spending money on me. Anytime we went out for food I was always made to pay for myself. There was on time that he paid for me, it was 12 dollars and he was mad because we were at a chinese buffet and " I didnt eat enough for the price of the meal." I dont like chinese food but it was a group of us going and I didnt want to be the reason why we didnt go where everyone else wanted too. He never tried to make conversation with my parents. I would have to tell him to say hi and bye to them before he left. He complained the one time he came over because he could only stay until 12 and was only over for an hour. He said that he wasted gas. I never met his parents. We dated for a year. The end of break up was tough. When we would get into fights I would always say that I was done and couldnt do this anymore. I never meant it I was just angry. I never left him alone and I was never done. I said it out of anger. When things were ending he told me he didnt know what he wanted anymore and that he just wanted to stay friends. I couldnt be friends with him so after humiliating myself a few times and confessing my love to him for the first time over text (Just to be told by him that we will be friends eventually) I cut him out of my life entirely. No communication. No more following each other on social media. (He is still friends with my sister which is making this super difficult to move on because she sees him every weekend and comes home and tells me about it.) A month and a half later im still having a difficult time getting over this. I recently found out that he put the blame on me for the break up because he was tired of dealing with me "ending it and always needing a break." I understand where he is coming from. I just dont understand how he could put it all on me even though i stuck through some bs that he put me through...

Ok, he lied to you. He complained if he spent money on you. And generally made you feel bad. Good riddance. You need to get over him. He did not treat you well.

Now as for your sister, she needs to stay out of it. If she is going to spend time with him and his friends, she needs to not talk about. And frankly she should have never touched his phone. You and she both sound like you need counseling to get over your trust issues. I suggest you do that before you try to get into another relationship.

That is waaaaaayyyyy too much to read.

Of course he is going to put it all on you, he doesn't want to look bad. I hope you learn from this relationship and choose better next time. Just put it down to experience in a few months you will be ok, just move on.  Always keep your girlfriends when you are in a relationship,  don't become too dependent on your partner for your emotional wellbeing.  Your partner should be supportive but not carrying you, keeping your friends will help you with this. No woman wants to date a tight man, if you meet someone and moths fly out their wallet make a quick exit asap O_o

What's with the obscure questions????