Husband's erection subsides, need advice ⇐ General

[Guest]

Hello.
During sex with her husband, he has an erection recession (the member becomes soft a little bit) and so during sex it can happen several times. This makes me anxious when I ask, I answer differently, sometimes I’m tired, sometimes I don’t know, sometimes I was afraid to make noise, sometimes one testicle hurts ...
We have been married for 15 years, married for love and there is always and always sex of high quality and often . With the exception of two pregnancies, those who have children will understand.
But about a year since this problem appeared, and I can not understand what is happening. I start thinking to myself that my husband has stopped loving me, that he doesn’t want me anymore or loves me, but he doesn’t want sex with me or he has problems with potency, but he doesn’t admit (he doesn’t want to go to the doctor). No mistress as far as I know. We have sex regularly 1-2 times a week. He is 42, I am 36. Tell me, what can be? Why does this happen to men?