What is going on

Id like some guy to answer this- my boyfriend came to see me and wanted sex, however he lost his erection and could not get it again. He is 58. He then blamed me saying he has no attraction for me anymore. This is priceless, after a 2 year relationship and very good moments. I thought a man would have an erection with anyone, especially his woman, but generally with anyone, unless he is losing it and now blames the woman. Id like to know what is going on . Im attractive, intelligent, nice looking, nice body, there is nothing wrong with me. He himself says all those things to me, but when he loses it he then blames me.