Im confused now more than ever.?

So i went out with a boy for about a year and 3 months. It was pretty amazing. I had a lot of fun with him and i fell in love with him, and he fell in love with me. Towards the end of our relationship he started doing bad things like he shook me cause we were fighting and he wanted me to calm down and then a nother night he threw a shoe at me at a party when he was mad cause everyone there woke us up, and then weeks later we were fighting in his truck and he tried pushing me out cause i didnt want to leave. i broke up with him that day. A month later he told me he wanted to change himself cause he didnt want to be like that. He started to see a therapist, and he started working on his anger and walking away from situations that make him mad. He told me he feels better about himself when he has control of his anger. I no he will definitly work on himself, but me and him both no that there is a chance it wont work, but he said hed try his hardest so we decided to be friends til we were both sure it was ok to try again no matter how long it takes. Threw this month, i met a 25 year old guy that treated me well. He was very nice and my family loved him. He is one of my brothers really good friends. The only negative about him was that he was a pothead so he smoked weed 24/7 and i dont do drugs at all and he is also on unemployment. I figured if i went out with him he just wouldnt smoke around me cause he knows i dont smoke, but he just continued to smoke around me. It got annoying caus ei just wanted to spend the day with him without him being high and he couldnt do that for me. He broke up with me cause i couldnt deal with his weed smoking and he wasnt willing to compromise with it. He said he would never change that about himself. Weeks later i texted him to say happy bday and he said he missed me and that he wants me back. I told him it didnt work cause of the weed smoking and he said He wouldnt do it around me and it would be like he doesnt even smoke at all. I just dont no what to do anymore. I thought i wanted to give my ex a chance to change, but then i have this other guy that is willing to try again and not smoke weed. This is hard and i dont really no what to do.