To say or not to say

[Angelfish2021]

Was seeing a guy at start of the year, ended it in May but we have become casual fwb every month or so since July until present day.
His friend's bro has asked me out which I'm keen on going.
I'm not sure if the new guy knew I was seeing the fwb guy or not.
I had no intention of seeing fwb guy again anyway as he's been quite dickish of recent.
So if i go with new guy, do I mention the guy I was seeing, do I assume he knew and don't mention it, or do I just not mention it? Not sure if it's relevant or not but not wanting it to come out at a later date and him wondering why I didn't say iyswim

Of course you tell him! It might be a complete game changer for him ( and the bloke you are shagging) .

Fair enough but before we arrange the date?

As part of the conversation on the date, just say that your most recent thing was a casual relationship with x, you are aware you may know each other, so just letting him know, there is that history.

See how the date's going and casually mention if it's got potential. If he's got a problem with it, that's his issue.

Don't mention it. You are single and it's your private life. You don't owe either of them anything.

Thanks I think im way over thinking this than is actually necessary!!

Put it this way then, how would you feel if the situation was reversed?

I dont think I would pry too much in his past, as long as we are both single now, it's hard to say I can't really imagine how I'd feel.
If he had hooked up with an ex a few weeks ago that's none of my business
If we started seeing each other and he continued to hook up with an ex then that becomes my business

But the ex is his brother! It’s a bit more complicated than you are single and your past is your private business.. And if it’s not that big a deal to you then why not tell him anyway. Surely it’s better to let him make th decision for himself rather than a bit further down the line when you might have developed more feelings for each other.

I would see how it goes first, I would mention it when/if you think it's going to go somewhere

No it's his brother's friend just to clarify!!