I hope I'm not speaking out of turn here, but why is it you that has to make an effort to keep in touch with your daughter so she doesn't grow up not having a father? It was your wife who was unfaithful after all. IMO your wife should be the one fighting to keep in touch with your daughter, not you!!!!!
[EDIT]
Just to clarify, I'm not saying your daughter should stay with your wife and you shouldn't feel compelled to stay in touch. I'm saying you shouldn't assume your daughter would stay with your wife and you would have to struggle to maintain contact.
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moto