Wrong, then right

There is this one thing which really confuses me. Can something which has started wrong end up right? I have just watched a movie. The woman and the man met when they both wanted to take revenge on their ex. Accidently they fell in love without noticing it. Anyway, I'm wondering if this relationship for example could be considered as true love or not. After all, the first reason why they got along with eachother was this revenge interest which they had in common. So, the base was totally wrong. And though, they fell in love, resisted a bit at the beginning and then their love won. Let's talk about real life. It's often said that two people who are fighting at the beginning end up as a couple, ''Was sich liebt, das neckt sich''. I think that's very childish. Maybe you can see it as funny and cute but definitely also as immature and superficial. Real love is about respecting, trusting and then thinking if this person is the right one and other half of your heart with whom you'd like to share the rest of your life. It's a feeling which doesn't happen by accident nor by coincidence. It needs time and develops until it reaches a certain level which could be called the love of your life. That's why I think it has to be based on something relyable, something real. And if you looked around, it is the same in many things, for example: architecture. If the base isn't right, the whole building will fall down. Maybe not at once, but certainly after some time.