breakup help

hi, me and my boyfriend of a year and a half broke up 2 weeks ago. this is what happened, but its lengthy.

so while we were tg he said stuff abt girls n their bodies, he said he would break up with me to do stuff with this one girl, I js idk told him to stay away from her bc like I knew he probably didnt mean it but it obviously still hurt, I got over it and we got better and more comfortable he was my first kiss first hug first literally everything, we were on hoco court this year and shortly after I found out he had been smoking weed behind my back and my best friend knew about it and didnt tell me, me and him got into our first real argument and I told him not to smoke or talk about girls in that way, he agreed and promised there was nothing else. I get a text from and ex friends like a week later saying he cheated on me and all of this, another girl texts me and says he cheated with a girl from another school. turnsout he had talked to the girl I didnt want him talking to and he realized it was wrong and blocked her, but it was nothing inappropriate. I still felt betrayed since he promised there was nothing else and the anxiety of people knowing something i didnt got to me. i spent about 5 months with extreme anxiety but I didnt wanna leave because he always comforted me even though he was the one hurting me. he promised on his life, my life, his families lives, his passed baby cousin and grandpa that he wouldn't lie again and then he did lie again, he told his mom bc he felt guilt and she made us break up because he was causing me so much anxiety. i wasn't ready to so we were both sad. about a week after we broke up we were still close friends and I found out that he told my friend she looked really pretty. i got madand we stopped being friends because he told me he wasn't over me and he wasn't flirting with any girls and he wanted to be single. yesterday he told me he was talking to people and enjoying his freedom but he was only talking to them as friends but today I found out he's talking talking to someone but won't tell me who. we were together for a year and a half and it's only been two weeks since we broke up and he's already talking to a new girl after telling me I "showed him what real love is" and telling his parents that I was the girl he wanted to marry. i dont know what to do im physically sick and I want to move on but my body isn't letting me.