There are three guys in the case; all three
belonging to different era, different positions and different
lessons. Beneath the problems, lies a similiar situation - guys
appearing at critical moment to shake your relationship
violently.
Guy K had successfully chain you within the grasp of his seduction
and is pretty sure it would be, especially, seduction law 1, 6, 9,
12, 17 and 21. (Don't ask me explain each of them - not important
at all). The crucial note you have to realise is that this
attraction bond you had with him did not sever right in the
beginning. It set roots within your heart and clings to you like an
undetected virus. When the time has ripe and he make his
appearance, this virus rebel within you and shook your
emotions.
Actually, irregardless of the love involved, if you haven't realise
by now: at that point of time, you are not exactly ready for
marriage. Issues are lurking in some corner of your life and by
avoiding doesn't neccessary meant that these are past chapters.
Furthermore, your
marriage is born from LDR - which is treading on hazardous
ground if you were to decide upon marriage within months after LDR,
or still within the process of it.
It only took you a few months within marriage to
realise that this guy you are married to, isn't a man you could
foresee to live with for the rest of your life.
You married for the right reason - but reality and
basis of relationship wasn't substantial enough to hold your
marriage.
A is a new guy that pops out and as mentioned, he is the kind of
guy any woman who loves to have as a boyfriend. I presume you are
still quite young, for this man you are considering is still
studying.
From your past and everything else, you grew cautious about your
environment and the new man that pops out - you said you feared to
be hurt. Ironically and unknowingly, you are putting yourself at
certain risk to be hurt if you preferred to remain in the grasp of
K's unfulfilling love.
The new man, not too sure about that.
But your old flame? Defintely, hurtful.
You tried to address the issue and that confrontation has to be the
concluding chapter for K. Don't seek for K in A - learn to release
your limitation and set yourself free from K. Learn to see A more
than just someone who is caring, kind, loving (or a man that woman
would love to have) - see A as himself. Conflicts
and personality will definitely surface as you know A better -
learn to see him as a whole, not those few qualities.
P.S: You can only move after you resolve your thingy about K in
yourself. A can only come in after that is done - you can't
multi-task. Avoid trying to do it simultaneously. 
Cheers
