why did he do this?

Hi so me and this guy had a fling for awhile I’m becoming closer friends with his friend group but he told me that he still has feelings for his ex and that he didn’t think we were going to work out also because he is leaving away soon and like I kinda felt the same way so I agreed! I haven’t talked to him for almost two weeks and today I texted him and told him that I didn’t want awkwardness between us because we’re kinda in the same friend group and he left me on read. I was just wondering what could be possible reasons as to why he did that? I get that we’re nothing but I was just trying to be mature. So I guess it will stay awkward between us :(