Magritte used to say that understanding his work is missing the point. He was afterall a surrealist.

It may be something as simple as love is blind. However, being the internet junkie that I am, I googled and found something rather interesting:

According to Magritte biographers he painted these images in reaction to the occasion of the drowning death of his mother. The scene was called to the canvas as a reaction to seeing his mother pulled from a river with her dress wrapped around her head as she was taken from the water.