I agree that it's not about how you feel about the other person, it is about you as a person on the above posters post.
I will try to be honest - it's an anon forum anyway!
I will admit I have been tempted in almost all my relationships at one time or the other and it was always through unhappiness. I am not sure teenage years count, but I was a bit of a mess and cheating was something that was a bit tit for tat (I'm talking like 16,17).
I recognise that I find the practicalities of monogamy quite difficult, but then I very very much do want to be monogamous to someone that I love. I'm trying to be self aware that this is a battle between the subconscious urge for validation and not wanting to break trust and respect and behave in an immoral way. I don't want an open relationship or anything like that.
I am almost 40 but have only had one normal non abusive romantic relationship my entire life - the one I have now. And I have been tempted to cheat but haven't acted on it physically. I found the strong attraction very overwhelming.
I think this. You can be given confusing messages during your formative years about putting yourself first, and not another person but then I have suffered child abuse where I wasn't important and then abuse by partners where my feelings didn't matter either so I recognise I am very conflicted subconsciously about my morals and self worth and a 'normal' relationship and especially that with men.
People can change but they have to want to and understand themselves.
You can go your whole life either alone because you are scared of being hurt or take chances and hope you trust your judgement.
I never assume something is forever. I will never marry. I know that it might not last with my DP but I want to try to enjoy it while it is good. I want it to be a good thing. I don't understand how you know that person is a forever partner and are then surprised when it doesn't last forever. People change and grow.