becoming good friends with your ex?

So recently my ex and I broke up. It has been 3 weeks since the whole breakup happened. I've deleted everything off my phone such as pictures and other things, cried constantly for the past 2 weeks straight and isolating myself from the world. But I couldn't bare to delete his number. But I've kept it as I didn't want to let everything go as I stilled loved him. I've haven't contacted him ever since the break up. After the past couple of weeks I've gotten a grip of myself and came back to reality and started doing the normal things I did before I was with him. Anyways, he recently contacted me after I finally thought I got over him. But that wasn't the  case. We talked about things and asked about what happened. He said "I still love you but I think we should be better off as good friends." I wasn't mad or anything about it even though I wanted to be with him. I realised that it would be better off as good friends as he wasn't ready to get back into a committed relationship. I'm happy that we are able to still be in each other's lives and regardless of our past with each other. We still love each other but we think that we can be truly loved by someone else. I know it's odd how you can still love your ex but let them go and love someone else. But we are now on good terms and talked about everything with each other from when we were together, to how are friendship is going to be and I like it knowing that I'll still have him in my life makes me happier than ever. But is it okay being good friends with your ex knowing that you guys had a past? Cause I know jealousy can get in the way of things but people are entitled to their own opinion and actions.