What is the meaning of this line, long distance relationship are known not not to last, on the future, lets forget about the past. nothing's impossible, so they say, got to be positive, and just pray.?

This line means most relationships don't last long distance, forget the dumb choices we've made in the past  let's move on in life either separate or together, nothing's impossible with Christ, and be positive and pray, by yourself, together, with others, and just pray that this is the real thing, and that it will be His will for it to continue.