12. They Follow and Talk to Their Ex-Partners on Instagram

You might not know it, but excessive infatuation and infidelity can manifest in a simple comment or liking a post.

If your partner is spending a lot of time talking about, following, posting, or commenting on ex-partners’ social media feeds, you might have a problem.

As reported in Psychology Today, studies have shown that “people were more likely to stay in touch with exes they still had feelings for.”

“Those who stayed in touch with an ex tend to be less committed to their current partner than those who did not.’

It’s generally not a good sign if they’re in constant communication with their ex. Who knows what that could lead to.

If this is something you’ve known about and accepted about them prior to the relationship, you will need to talk to your partner about how this has become a problem and why after all this time.

If this is a new behavior, it’s better to talk to your partner sooner rather than later, so that you don’t continue to worry about what it means.

Boundaries need to be set by you – and your partner – for what micro-cheating looks like and you both need to take responsibility for your actions.

13. Your Partner is Actively Adding New Attractive Friends

Your partner could be intending on texting, calling, and flirting with the new friends at the expense of your relationship.

We can all agree that there is something fishy about someone already in a relationship constantly interacting with people of the opposite sex.

14. Your Partner is Constantly on the Phone

If your partner used to leave their phone carelessly at your disposal before and now they always have it on them, there is something wrong, and you know it.

Psychologist Douglas Weiss, Ph.D. tells Bustle that a sign of cheating to watch for is “if their cell phone has a code on it or they take their cell phone to the bathroom, even at home.”

If the partner is going even to the strangest places with the phone, they most likely don’t want you laying hands on the phone.

If they never used to carry their phones and chargers everywhere, automatically there could be someone they want to communicate with all the time.

15. Your Partner Has Two or More Phones

But if you know for a fact that your partner doesn’t really have a need for two phones, then you need to ask yourself some hard questions.

Therefore, if you want to know how to catch an Instagram cheater, you have to learn how to outsmart them.

When you find the phone, and you suspected all along that the partner was cheating, you may find incriminating evidence to raise a concern.

16. Their Friends Are Being Weird

If you can’t seem to find any evidence of cheating but you are certain something is wrong, message his or her friends on Instagram and see how they respond.

If they barely interact with you, then something’s wrong. It’s a surefire way to tell if your partner is cheating.

Paul Coleman, PsyD, says that “there is a good chance your partner’s friends may know what’s really going on before you do.”

Friends almost always know what is going on, and if you are desperate to get the right information before you confront your partner, friends are where it’s at.

17. Your Partner is Only Following the Opposite Sex

You might dismiss it as your partner just being friendly and social. However, intense scrutiny will help you will unlock a serial cheater’s pandora’s box.