Fighting a battle that isn't actually mine

[4evernamechanging]

I feel like I know the answer really but it'll ask.
And try to keep it brief.
Years ago was seeing a bloke that I really liked, it came to an end.
A year later I got together with the father of my children, not long after giving birth OH went to social event and was jumped. Was left in quite a bad way. Left hospital the next day, had a day off work to recover a bit and went back the day after feeling like shit kinda thing. No broken bones, just cuts and bruises.
Never 100% knew who it was but people at the event had mentioned (the bloke I was seeing years ago) acting suspiciously before, even much so after and then disappearing after. Everything pointed to him.
We told the police what we knew, obviously no concrete evidence so nothing ever happened about it.
I'm one to majorly hold grudges and if someone fucks me over then that's it!
Me and OH are no longer together (on bad terms) and this bloke has reached out to me.
LET ME MAKE CLEAR I HAVE NO INTENTION OF REKINDLING ANYTHING WITH THIS MAN AT ALL EVER!!!!!
But should I tell him to do one because of what he may have done or do I accept his reaching out and go back to being on good terms with him

Why do you have to be on any sort of terms with him? In what a capacity is he in your life?

no,if he beat up your oh back then,why would you.
especially consider> do you want to have a relationship with someone else down the line.
he may have done and is most likely to do again

It's not an either/or situation. You don't need to tell him you think he mugged your ex, nor do you need to be on good terms with him. He may have reached out to you - but that doesn't mean you have to do anything at all. Just move on.

Just that we live in the same town, occasionally see eachother in the street kind of thing.. up until this happened we did really get on and I would say hello to him..it's not going to make the world of difference really but I would point blank ignore him up until now

Yeah I was thinking just ignore it. It really doesn't make a difference to my life.. but then it occurred to me that I'm fighting someone else's battle.
In reality I did think it was him and whether I get on with ex OH or not, that's the father of my children and that makes me angry to think someone would potentially do something to upset them