i feel it depends entirely on your true motive - if the motive and heart is pure, then it is the thing to do but, if you're only feeling a deep connection with your lover as a means to escape the world that is in front of you, or for validation, or simply because you cannot truly love yourself, then you may want to reconsider your decision
It depends on situation, another one of those.... if you are talking a person who you on pretty much on wedding terms, I mean, why not? Ask yourself, what is the worst that could come of the situation? If you really wanted to, could you came back? I've kinda been through it... not because of 'I'm in love so I'm leaving' type of thing, but I recently left my family and friends behind in Indiana to move to Washington with a guy, for better opportunities for me and my children. I had to sit down and ask myself those questions... it would put me any worse off then what I was (and I actually landed a much better job out here) and I know if I ever want to go back, I can.... no harm no fowl.