Especially if they still carry so much leftover baggage from the relationship: resentment, anger and other unresolved issues after the breakup, there is really no space in their heart for a new relationship.
And often they don't know that till they're in one.
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Being dumped for someone else is a double punch: not only do you feel abandoned but also replaced.
Bottom line is If they're still angry at you, they're not over you. Love and hate are but separated by a very thin line.
My take is he wasn't looking for a relationship, or at least unconsciously he wasn't.
Soon enough, your ex will start squirming, pulling away and be looking for a way to get out of their new relationship - and, if you play your cards right, start thinking of making their way back into your arms!
It's a quick fix if that's the case, one in which we can drown out our pain by reveling in the emotional intensity and passion of a new found love.
They just need help getting over you - and they think that being in another relationship will ease and speed the process.
They sometimes don't know that they are not ready for another relationship either even when they think so.
It’s a biological imperative to guard your mate – and now he or she is with someone else and you’re stuck with the harrowing, awful, alone feeling of knowing that the person you love is loving another.
Being left for someone else can also bring feelings of great shame: you may feel inadequate or unable to “keep” your partner. And, whatever the characteristics of the new man or woman in your ex-partner's life, you feel less special, less interesting, less attractive.