When they repeatedly try to take you back to big time romantic memories.
Every relationship long or short definitely has some very significant memories. When your ex seems to always push you in the direction of the very romantic ones that can start up things you thought were not even alive you should be careful. Memories create a big bubble and you end up floating in them. Before you say jack, you might be on a comeback journey with your ex. Just for safety reasons anytime you smell something fishy like that, don’t hesitate, RUN.