Would I just be beating a dead horse?

[No Gods No Masters]

So I have an ex-friend/boyfriend [we dated for a week and a half] that I kind of want to start talking to again, but not sure if it's worth any old bitterness that may arise. We haven't spoken in over 6 months, and it didn't end too well. Now, I have no idea if he'd be willing to spark up the friendship (and that's it!) again, so I feel like it I extended the 'olive branch,' he'd just throw it in my face....

I could go on and on about specific details, but I'll spare everyone the boredom...

Should I pursue the re-starting of a friendship or would I just be beating a dead horse?