2/2 live 8 handed

Rock straddle for 5 is out every single hand, preflop positions are weird.

Maniac rock straddles for 10 in co, he will literally open like 80% of the time. The other 20% maybe because he didn't feel it.

Effective 500ish
couple limpers
Hero limps A8KJ in EP
more limpers
Maniac opens to 55
Btn calls
Hero repots to like 240.
Maniac calls
Btn calls.

3way pot 750
Flop 67T
Hero??? we have like 280left, Btn only has 90.

Are we pot committed???
Maniac has random trash might hit or not, he's never folding.
Btn is also never folding for 90 more.

We limp/3betted because we were likely ahead. We wanted to get headsup w/maniac. I would most flops but what about this flop?

Seems close to me. Sometimes our overs are live. Sometimes we’re dead to a straight. My intuition says we should check fold for 280 and call if it’s just 90.

If we had a pair we’d for sure go with it.

We checked, maniac jams, btn calls.

We folded.

Maniac shows TJ43 no suits
Btn shows 99JQ.

Turn J
River 9

After maniac shows his cards is when I realized my overcards were live outs. In game I felt so stupid because I think I was pot committed to begin with, I also ignored that gutshot should be good alot of the time.
It's like my brain started assigning nuts to opponents ranges, I get scared then fold fold fold.

It happens but in multiway, a gutter is not expected since others can have your outs/blockers as in this case the button had 99. As stated, you don't have an overpair but over cards - if someone has 2 pr here, your over cards are no good - it is not the worse fold.

I personally don't think that you are pot committed but I can see why you would call especially if HU vs. maniac.

It's not close at all imo. You have a gutter, overs, bdsd with a third pot left. Very very very easy getin.

edit: wrote this before reading what you did and what they had.