Define suffer? For me it's not really suffering since in the end, he still get Aeroc on his side.
But yea, it will take a long time. Because our Aeroc here is an innocent arrogant count with high pride. And HE HATES Kloff lmao. Few times he slapped / Hit Kloff and this mf shocked himself, yeah Aeroc shocked himself since actually he scared of Kloff but his pride said otherwise

Yes it ended in ch 75. Yes ch 75 is the last story of main character, since our MC finally gets his own happy ending with his happy family. That's all we need.
And no, 3rd timeline is NOT part of main story, since no OG Aeroc here, just OG Kloff, the shitty commoner bastard with inferiority complex, and it will be a side story.
There'll be side story in few months (I heard it will be around May). But dunno which one.