I meant changing the outcome because you saw something in the dream.
I don't think the future is fully determined. Just some parts have to be because of our actions. I have some theories:
Theory 1: maybe the universe is like a machine, and while it gives the impression that everything is possible, reality is that some outcomes are just not possible due to some limitation. Kinda like a game, you can have infinitely many possibilities of actions in an open world game but still there will be some options not possible because you choose some action at the start.
Theory 2: maybe there really is someone who controls what happens in this universe. Like our dream is the announcement that something will happen but the enforcement happens later. And the exact nature of the enforcement depends on our and everybody else's actions. In other words it is not decided what will happen but whatever happen will not go against the dream. We just dont know what other things could have happened given a dream.
Of Course nobody knows the true nature, and we can only guess and ponder about it.
At the time probably yes, now we don't know/probably not. Note that love is complicated and has different types like there is passionate love and companionate love. Passionate love rises quickly within 6 months to 1.5 years, it reaches its peak. Then it goes down hill and within 7 years it goes to its lowest point. This happens to everybody not just you, naturally this love converts into companionate love over this time and when that does not happen it needs to end. Companionate love is slow in rising but it is also more lasting. Two main components of companionate love are 1) emotional intimacy - ability to share anything 2) commitment - that feeling that it is YOUR responsibility to help them if they need something. Any action that violates these will result in losing love.
Some actions that hurt love: lying, hiding things, feeling you're the only one who cares etc.
Know this, true love or companionate love is something both people nurture and grow, you cannot do it all on your own. If it ended then something went wrong, maybe nobody was at fault.
Take your time and heal my friend.