According to the laws of physics time travel is technically possible, but would require an immense amount of energy to accomplish.
Though I could never hope to muster that much energy I place myself in the past with you
Thinking that if I had changed this or done that one thing differently that you would still be here today with me.
Surely I could have changed the way things worked out

Or maybe not.

Maybe what happened was going to happen would still happen
Just maybe at a different time
And at a different place
But with the same end result.