I was in a similar situation previously and it needs time (and I'm talking about much more time than a month here) to get over something like that. Working on something else and completely new might help.
Other than that:
I wouldn't think of it like this. First of all, if that friend blocked you everywhere, they won't see your comic so it's not rubbing salt anywhere. They would have to go out of their way to look for it and I think that's highly unlikely. Otherwise, what would they have blocked you for?
Which brings me to my second point. Now, careful warning at the beginning: This might hurt you a bit, sorry about that already but as I said I've been through some similar situations before and I think I have a slightly different perspective on this and feel that I should bring it up just in case.
So I don't know the specific situation but in my experience feeling hurt isn't the only reason to block people. Honestly, I've blocked people myself and it's never been because I've felt hurt but only ever because the people were just getting severely on my nerves, I was angry at them because of something or because I felt that I didn't want to have any contact anymore because our values didn't align.
Now, I'm not saying that it's the same in your friend's case but it could be that you're reading too much into the situation. If you had trouble with each other several times before, then maybe they just felt it was too bothersome and don't want to have anything to do with the project anymore because of that.
I mean developing stories and keeping up relationships both take time and energy and if one thing sucks too much of that energy, then it might be better to let go of it because people want to use their resources for something else. So they walk away to have a clean cut because if they don't and stay in contact with the other person, then the thing that was stealing their energy will inevitably come up again and they'll enter the same cycle once again which isn't good for them. So they just make the decision that is best for them.
I've been in that situation and I have made exactly that clean cut and consider it to be one of the best decisions I made in my life. I honestly wouldn't be happy if any of the people involved tried to contact me out of whatever reason but I have never cared about what happened to the project from back then regardless of the fact that I was very involved in it before.
So from my perspective: Just leaving the person be and continuing to do your own stuff might be good enough already and they might not care about the rest.