You asked what this is. I'd vote for "something else" -- your long distance girlfriend is a fantasy. Your wife is reality.

Since you expressed some concern for your daughter, there are two things you can do to help yourself and to provide a better life for her.

Stop drinking and start re-connecting with your wife. Instead of chatting and texting and emailing this other woman, start doing things with your family.

Everyone will be happier and your far away friend will adjust and make friends where she is now living.