Responses

No sorry I worded it badly
First life we have kloff1 and aeroc1, they both died only aeroc was much earlier and kloff is when he was old, their soul split. They will never meet again. Except there is an alternate universe for the two of them. Kloff1 and aeroc1 will never meet again but will meet another kloff and aeroc in alternate universes where they changed their actions and changed the endings (both dying miserably)
Aeroc 1 gets together with a non-revenge filled, still kind and justice loving Kloff
Kloff 1 gets together with a non traumatized and still prideful aeroc
Imprinting is evident in chapter 26 when Kloff said Aeroc's tears were sweet. Ive read a lot of omegaverse and sweet tears are an indication of an imprint which is different from a bond.
An imprint makes the alpha suffer more when they cannot be with their omega (common trope where the omega gets revenge by imprinting and running away) so it makes sense that Kloff in the third life suffered a lot more than Aeroc had in the second life because a bond is on the body but an imprint is directly to the soul (this last one is a theory though)
That being said, the pills Aeroc took on his first life did not affect his second and third life but he was one of those rare cases where the alpha becomes an omega either misdiagnosed because they are a recessive omega or changed later.
All three lifetimes Aeroc can give birth. It was only implied in the third life that he was feeling some changes in his body.