Someone spoil me a bit

Before I read this, I am aware that the main character was involved in a love triangle sort of situation. I already know who wins, but what I actually want to know is if there’s an actual build up to them ending together and I can see them like actually falling in love of something… or if, on the other hand, the guy is only chosen because he’s the baby’s father (and the lesser evil), and somehow they are in love now. If someone can clarify this for me I would be eternally grateful