3. She has no friends of her own
If your girlfriend or future wife does not have any friend already then it is very unlikely of her to have one after marriage. This ultimately means that you are going to be her only one for all her social interactions which could possibly cause some problems. As this could get really tiresome when you would want some time for yourself or your own friends but she wants you to be there for her at all times. So, if you think these things to be extremely tough for you to tackle then give a second thought about your marriage with her. Besides, no couple should spend their whole time together.