4.) Have no Plan B.
This should be a no brainer, unfortunately it’s not. Many people enter relationships with someone they grabbed out of the pool of the interested folks they were entertaining, but never get rid of the pool. Many no longer communicate with all the people they were involved with however they still keep in touch with a few of them for the purpose of having a back-up. They see no harm with having someone up next to bat. This limits the effort they put into the relationship during the tough times. I mean, why go through the bad times with someone when you can have a good time with someone new? It makes it a lot easier to walk away.