So let's say hypothetically you meet a guy that you just go crazy for. You date him for a bit and then he breaks it off but tell you you can still be friends. He keeps spending just as much time with you as when you were dating, knows you're longing to get back together with him, but has no intention of getting back together with you. Is he treating you well? Is he being a good friend to you? Is he sending you mixed signals?
And you probably know where I'm going with this, but that's pretty much how you're treating your friend / ex. So if you've moved on already and he hasn't, it might be best for him if you give him the freedom and motivation to start moving on by putting some distance between the two of you.
This is one of the best online articles I know on the subject and has led me to what I call the two hour rule: if you're not dating or intending to date you shouldn't be spending more than two hours a week together engaged in one on one interaction.
https://www.boundless.org/relationships/not-your-buddy/
And in answer to your original question: no it's not weird, but it's likely setting him up to deal with even greater hurt and rejection down the road