Who better to let us in on the secrets of infidelity, than someone who has been the other woman? 29-year-old Clare, who has since broken it off with her boyfriend who turned out to be married, wants to help women spot a cheater before it's too late.

"I never thought that I would become a mistress - I hate the idea of taking another woman's husband. I was effectively conned into becoming the lover of a married man," she lamented to The Sun,"I believe men cheat because they reach a stage where they wonder if that is all there is and want to test their manhood."

Continuing, she confesses feeling guilty for being tricked into a relationship with a married dad of two, who had told her his marriage was over.

"I have made a promise to myself, I will never be a mistress again, as my relationship with a married man ended very badly and left me both depressed and ill, with my self-confidence shattered," she shared. "I'm just glad I can help other women spot the warning signs."

Here are Clare's clues on how to tell if your partner has another woman.

1. FREQUENT LATE NIGHTS

Do you find yourself often going to bed before your partner? If your spouse stays up a lot when everyone else has gone to bed, it could mean he is doing things online that he'd rather keep private. Of course, it could just be he's working or needs his privacy, just make sure not to take this possible warning sign for granted.

2. CHANGE IN SPENDING HABITS

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Partners who cheat sometimes engage in mystery spending, even going so far as to apply for a new credit card without your knowledge.

Also, be on the lookout for expensive purchases.

We are all entitled to spend our hard-earned money, but as a married couple, you should be more upfront about your splurging, to make sure it doesn't affect your marriage.

3. A CHANGE IN MUSICAL TASTE

This may seem a bit far-fetched, but according to Clare, a man who suddenly develops a love for a new band or certain genre of music, may have been influenced by another woman.

Trying to impress someone who likes a particular type of music may mean downloading a particular band's entire discography.

Of course, this isn't a tell-tale sign and may not apply to all, so it's best to take this tip with a grain of salt.

4. INTENSE SECRECY ABOUT GADGETS

Multiple passwords or lock codes on his phone, laptop, and social media accounts is a definitely a common red flag.

Though we are all entitled to some privacy, a person who has nothing to hide will be fine with sharing access to these when asked.

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5. SARCASTIC ANSWERS

According to Clare, a cheating husband often makes up stories to cover up lies.

They often resort to sarcasm or wise-crack answers to distract from their inability to answer questions honestly.

6. SPENDING TOO MUCH TIME WITH A FEMALE CO-WORKER

Calling her a female co-worker was how Clare's lover managed to sneak around, using work trips as an excuse.

If your hubby is spending too much time and effort on a co-worker he insists is just a friend, be extra cautious.

If the co-worker is extra flirty, it could even be more dangerous.

7. NEW HABITS AND MANNERISMS

If your husband has started using trendy phrases or new expressions and gestures, watch out. Who have they been spending time with? Clare shares it is often overlooked, but a definite warning sign of infidelity.

8. BEING MORE 'NARCISSISTIC'

Has your better half become more committed to buying new clothes or losing weight?

This could be a sign, says Clare. Of course, hitting the gym isn't a 100 per cent sign that they have another woman. They could just have decided to pursue a healthier lifestyle, but this should still be considered a red flag.

9. SEX HAS BECOME A CHORE

If there is no longer a spark in the bedroom, it could mean that they have eyes for another, but it's also important to note that boring sex could also be a natural side effect of a longterm relationship.

ALSO READ: 'I found out that my husband was cheating on me with my sister'

10. HE BECOMES EMOTIONALLY DISTANT

He no longer opens up about his day or his feelings. Even during fights, he is no longer invested enough to argue or talk it out.

This article was first published in theAsianparent.