My Heart Is Gone

So I have had a rough time since February. My ex boyfriend cheated, lied, and was messing around with other girls. Everything escalated over every month now everything is going back to normal. I spent so much time being angry that I didn't get time to grieve so to speak. I am happy and seem like it, but the memories are too much. I mean he looked me in the eyes everyday and told me he loved me, and didn't look at other girls while he did. Especially when my uncle died he barely even cared about it. I loved him for 3 months and gave him my all. My heart is even gone. It feels so weird I am just heartbroken. He said he even wanted to marry with me as his #1 goal. I ignore him and what not, but I am just hurt. Please give me any advice I don't care how long it is.