Literally only 12 chapters before the end of the story, our MC is on his way to participate in generic cultivation novel world tournament. Out of nowhere, in the middle of MC's fight with some random fodder, the final boss just invades the entire universe and starts annihilating everyone. MC goes to defend his homeworld and suddenly stumbles upon the final piece of a map that turns into a memory crystal that reminds him of his past life as the supreme god protector of everything. The map leads him to his old god corpse so he merges with it. After he merges (100 year timeskip) he realizes the final boss defeated, crippled, and ens*aved the whole universe (including all of MCs friends/family/lovers). He fights the final boss, "struggles, " wins, and then uses his super awesome magic god powers to fix everyone's cultivations and then all the final boss's minions get killed and peace is restored and he's worshipped as the god king of the universe. The End. Oh wait no MC also receives a random "invitation" through a spontaneous wormhole at the end (literally just appears in front of him while he's relaxing) and he smiles at it mysteriously and goes "so that's how it is". I think the author was trying to set up a crossover/expanded universe/sequel but given his track record with this story I doubt that will go anywhere

There's only 2 girls. A 3rd one was set up at some point but the author abandoned that. We only really get romantic development (and not much) with the 2nd love interest because the 1st one gets taken away by a higher power twice (the 2nd time happens literally immediately after MC rescues her from the first higher power). MC never gets to do the rescue arc for the 2nd higher power because they get annihilated by the final boss (see aforementioned spoiler shenanigans). She's just spontaneously reunited with him at the end of the story.