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-What are your ages?
-How long have you been dating or talking to this woman?
-Are you serious about being with her?
-Do you think she will be upset about this?Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.
If she already has trust issues from her marriage then don't fuel that fire be honest with her if she loves you she will understand that sometimes divorces take time and as long as you are not living with your wife she will understand. You have to tell her the truth before you make plans to meet her children because she may change her mind about you meeting them until you are legally divorced, give her the choice of whether or not to allow you to meet her children now. I think she would appreciate the truth more than you not telling her something that important. Allow her to decide as to what to do from there leave it totally up to her and tell her that you understand her concerns and that you have no feelings for your wife it's just a legality that is taking longer than you had hoped it would. It would be better to tell her in person but since you are an ocean away maybe the next time you talk to her on the phone and are completely comfortable telling her let her know then but make sure you do it when you are ready to tell her emotionally. Once you tell her or if you decide to tell her hear her out about how she is feeling after you tell her this will show that you truly do care about how she feels and just want to go into the relationship without any secrets.
I meant that you don't know what her reaction will be and you don't know if she will want to slow things down until you are legally divorced and not allow you to meet her children and that is what I meant by being emotionally ready for her reactions to the news that even though you are separated and no longer together you are still legally married. I think you should tell her within a reasonable time frame and not wait until you are ready to meet her children this will upset her to know that she was introducing a married man top her children and you don't want to take that chance. It's best to tell her the truth but it's up to you to know when that time is.