There are a lot of ways to catch a cheater. Coming home early to catch your S.O. in the act. Noticing they have 10 missed calls from Domino's Pizza. Heck, opening Instagram to find that they posted a photo of someone else for Valentine's Day. It's brutal out there for us hopeless romantics, but thankfully there are a few clues to help you catch your cheating partner before they entirely break your heart.

From sudden changes in phone habits, to receiving five visits from the water guy and even getting a wedding invitation in the mail from a good pal of theirs, here are 21 clues people used to help prove their partners were stepping out on them.