Is my husband thinking about replacing me or cheating on me?

I am a snake born 13/5/1965 my husband is a rooster he was born 22/11/1969 we have been married for about 11.5 years we got married 13/11/2002 and we couldn't have children so this keeps me suspicious of his behavior all the time and restless and we are having some financial problems and his Mom is making me miserable she is very attached to him in which makes me sick and scared plz advise
my name is Lana and my husbands name is Khalil. thank you