break up

So my boyfriend of 3 years and I broke up 3 weeks ago, no drama no huge fight it just ended. We talked for the first few days and then just stopped, not even a week after we broke up he started dating some one else. The second week into the break up I was fine, now it's the third week and I'm fine But there are times that I feel like there's this heaviness weighing on me. He was my first boyfriend so this is my first break up, I've got him block on social media so I won't see them together at all. I just don't know what to do like I want him to be happy but i hate that he's happy and I'm only kinda happy. It's funny because I know the person I miss is who he was not who he is but I find my self saying to myself I miss my best friend.