Guys, since you address this to The INFJ species I ascertain that you are open to input from Ni kind. I ask that you read my response with objectivity and emotional distance, in other words, don't take it personally as I really don't know you. These aren't accusations and they're not all really ENTP behaviors. I've seen them in some other types, too, to some degree.
Human relationships are rarely logical and never easy. Misunderstandings and presumptions cause people to speak without calculating the impact or outcome of their words.) I've seen a lot of break ups comprising personalities of every type and one fact remains true in every case; unless one member is an absolute tyrant and psychopath, it's not one-sided. So, I'm asking, "Did you contribute, in any way, to what happened to you?"
Did you violate your Ni's "scared"values without even realizing it?
Were there times when you just dropped the ball and left her hanging because you got bored?
Was there ever a time when you made promises and didn't follow through?
Were there times when you used your partner to stroke your own ego and didn't notice she was dying of humiliation or maybe just felt you devalued her intelligence?
Or were there times you presumed to know what she was thinking or prescribed thoughts for her?
Was there ever a time when you hatched out some grandiose scheme that negatively impacted her life but you didn't notice?
Did you ever cast her into a per described role that you had concocted because it fit into your idea of the perfect "woman? Thereby completely failing to see her or value her for who she really was?
Did you badger her to talk about her feelings? (I'm a heavy Ni user so this one is a personal pet peeve.)
Did you snoop into her private world without an invitation and if so, did you ever make light of something you found there?
Did you ever use her to advance your own agenda?
I don't defend her for lying or cheating, but these things don't happen in a vacuum. There must have been a catalyst, unless she was just a heartless devil and I doubt that was the case.
As hard as it is on our ego sometimes, in any broken relationship, we have to stand back and try to see the whole picture.
Also, maybe it's not about finding the perfect type for your fit. Maybe it's about molding the best character in yourself that you can mold and then the right person will be attracted to you. She may not be an INFJ, but it won't matter.
Again, I think it's great about being a stay at home dad. And of course you are worthy, but maybe just focus on interacting and enjoying life. I think romance and all that stuff is highly over-rated,
(then again, my family says I'm a Vulcan, so there you go.)
I hope my words don't offend nor do I wish them to be a fuel for a "jump on the OP" bandwagon. My intentions are to say something of value, something that might broaden or add perspective.