But "the land in the dream" is a dream, and there is always a moment to wake up, so it also implies that your (happy) love life is very short; That is, you are likely to be in a node that has been separated or is ready to be separated. ...
If it doesn't mean this, it means that your girlfriend didn't fully understand the meaning of this sentence when she quoted it;
In that case, this sentence can be understood as: Being with you is a very happy thing (just like living in a wonderful dream and never wanting to wake up).