I Believe My Ex Of 4 Yrs( Just Left A

I believe my ex of 4 yrs( just left a minth ago) may be suffering from anhadonia (?).....he has severr depression due to his job.... & several major let down in life 2 minths prior to him leaving..... Our relationship never changed..... No arguing, fighting ect. Nothing..... Just announced his fillings of live wernt the same..... He doesnt no when they changed..... But he has said things in the 1 time we have spoke like repeatidly saying "he didnt want to leave..... Im at loss to all of this..... i do no i was depressed during the last several months due to other family issues...... his fillings of live never showed any signs of any if this happening