Contact ex's friends or not?

Hi all, my boyfriend of 7 years broke up with me a few weeks ago by essentially dissapearing before Christmas, not replying to a Christmas dinner invitation, and then giving notice for our apartment. I think this was a really bad way to break up after also living together for 4 years. It has been extremely tough for me because I really loved him and he was my first boyfriend. But, deep down I know we aren't right for each other. The way he would treat me after a tiff really showed me how undedicated to us he was, and about how little he cared about me being sad. So I will cope. I have a great support network. However he does not. His family is overseas, but even then, he doesn't communicate when he is not ok. I think he suffers from mild depression, and I'm sure he will try to console himself with drinking, pot, and gaming. My questions are, one, if it is inappropriate to contact a few of his friends to tell them we are over and ask to check in with him from time to time. Is that weird? I am done, and don't want to hear how he is doing, but he doesn't see his friends much and doesn't reach out. They have known me for 7 years and like me. Secondly, I never got to say goodbye because of the way he broke up. He won't even meet to split our stuff up. I guess it's his coping mechanism. I'm going to get the rest of my stuff. Should I leave a short goodbye note that just says thank you for sharing 7 years with me and good luck. Or is that too much given how cold he has been? I really dont know what to do hear, but there has been no closure. I'm 27 and he is 34 if it matters. Thank you

Do what you think is best to do for you. You want/need to leave a note, if that gives you closure, then do so. You don't have to contact his friends etc because you state that you are done. Make sure you continue to tap into your support network to assist you to cope when you need to.