This kind of thing is always mistaking correlation with cause. It’s not the what it’s the who. If the two people are a good and supporting couple that will be able to make a long term commitment then they are a good and supporting couple that will be able to make a long term commitment whether or not they move in together before marriage. If they aren’t then they aren’t and no amount of waiting for marriage or not waiting for marriage will change that.
RE: This kind of thing is always mistaking correlation with cause
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I can agree with you to a certain extent.... however there are STUDIES made regarding this issue.
See for instance, Post #23 above.