Solitude
Loneliness is not what a person desires. Especially, women don't like this and they would not want to be away from their partner, but they don't like, not being the first preference in his life. Which gives her the taste of loneliness. She will probably move on...
Self worth and search of identity
A woman might leave you if you don't treat her right. If she in love with you, she gives her whole self to you and if you don't seem like you are doing the same, and don't acknowledge her identity as a human being, first, then she might get the idea that you don't think of her as an equal and this might result in her fleeing away from you. Respect her and she will never leave your side, treat her right and she is yours, forever.
Bedroom tales
If your bedroom life becomes too boring, she might leave you, because that is the essence of life, if you don't keep her happy, rather, bore her, then she might leave you. If you bore her, it leads for her thinking that she doesn't matter to you, the relationship is meaningless and she needs to be worshiped, not bored.
Midlife mess
Women go through hormonal changes and when this happens, she starts having thought about her existence in everyone's life and it conflicts in her brain, which is why she gets disturbed. This might lead her into being single rather than being in a relationship. If you keep reminding her of your love for her, she would think otherwise. Just take care of her when it is needed.
Routines
There is no one, who loves to follow a routine, and we are not just talking about the bedroom, but even out of it. Because it gets boring after some point and it is not quite healthy for a relationship. Women lose interest and you have to keep your relationship a little bit unpredictable, surprise her time to time and she will love the exciting adventure of life with you.
