NOOOO!!! I have known plenty of people to go back to their ex and I have as well, twice (diff exes). Not a single one that I know of worked. There’s a reason it didn’t work the first time and that reason doesn’t just disappear with space. It’s forgotten until it’s reappears. You’d much rather give 20 guys chances than the same guy 20 chances. Don’t even start with the second.