Haiz...
seriously, emotional control is difficult to master especially when
peer influence, pride and lust is strong. We all know the right
thing to do at the right time logically, but when we are thrown
into that situations, emotions BLIND us entirely and the result
turn out to be a bunch of rubbish regrets we feel later on.
You wife is pregnant and while you told her the truth, she kept
quiet at first while is BECAUSE....
I) Psychologically giving excuse to defend you. She being pregnant
cannot satisfy you sexually. You probably seek elsewhere to get
some form of kicks.
II) Being honest scores points. You are honest with her, therefore
she cannot take advantage of this. If she found out herself, trust
me, hell hath no fury by then.
III) Analysizing current situations about the relationship between
the both of you. This is the most important consideration -
weighing physical or emotional betrayal. In some sense, the latter
is more dangerous and fatal than the former.
These 3 points completely conflicts her mind and heart. 
***
You only have one option to choose. Love her? Avoid situations
where you know you will hurt her. More important, I hope you
realise by now avoiding desire is 2nd degree solutions. To prevent
future related-similiar crisis, you have to acknowledge that girls
will always be around and only yourself can battle your desire
because if you land in situations where you cannot avoid - you are
alone.
CEASE lying of all form immediately. Censoring of information is no
wrong, provided it's reasonable. Love Seventh Law stated:
Lying destroy intimacy.
Renew, rebirth, recover.
P.S: Others may be better than your wife, but she is certainly the
most suitable for you.
Cheers
