Sadly, your friend was already intrigued or attracted to your ex before the two of you broke up.

Flirtatious exchanges occurred between them, whether it was through eye contact or physical touch, while you were still in a relationship with your now ex.

These flirtatious exchanges were subtle enough for you to miss them, but they probably happened.

Meanwhile, your head was in the clouds, hopelessly in love with him, when in fact he had already exchanged some flirtatious moments with your friend.

The point is, it’s unlikely your friend and ex-boyfriend just recently realized they had the hots for each other.

Usually, they already felt an attraction for each other while you were dating him and head over heels in love with him.

Here’s what’s worse.

Those flirtatious moments sometimes transition to physical sexual activity between them.

There are plenty of cases where a friend gets physically involved with her friend’s boyfriend while her friend is still in a relationship with said boyfriend.

She pretended to be your friend, but behind your back, she was getting physical with him.

This is especially likely when your friend starts dating your ex fairly soon after the breakup occurs.

Whether these two were having flirtatious moments or actually engaging in physical activity with each other while you were dating your ex-boyfriend, there was an unspoken tension between them.

This tension usually has an indirect influence on your relationship with your ex-boyfriend.

Unbeknownst to you, his lackluster performance in the bedroom that became apparent in the last few months of your relationship with him was a result of his desire to be sleeping with your friend instead.

His lack of affection or empathy towards you had to do with his desire to give his affection and empathy to your friend instead.

His criticism of several of your hobbies and interests had something to do with his desire to engage in the hobbies and interests of your friend instead.

All of this was happening while she pretended to be supportive and loving towards you, when in fact, she was underhandedly a part of what led to the demise of your relationship with your ex-boyfriend.

To reiterate, the sooner a friend starts dating your ex, the likelier that friend was surreptitiously instrumental in what led to the breakup in the first place.

Even if none of this backstabbing or underhandedness is relevant in your particular case, you still have every right to be mad if your friend starts dating your ex.

This is especially true if you had an acrimonious or traumatic breakup with your ex-boyfriend.

It means your friend is insensitive to your feelings.

Every social media post or conversation she instigates, with him as the focal point, has the potential to cause emotional anguish in you.

Given the sheer volume of eligible men to date in your city alone, there is no excuse that validates her reasoning for choosing to date your ex-boyfriend.

This speaks to a selfishness on her part that should make you question whether she is a worthy friend.