Hi. My Bf Is Currently On Antidepressants For 3 Months

Hi. My bf is currently on antidepressants for 3 months and for the past month he keeps saying he is not happy with our relationship and even though we still have great sexual
Life and his sex drive is ok due to anabolic steroids he takes, sometimes he says he doesn't know if he is happy with our relationship as if he lost the passion for me.he is unhappy with the way he feels and swears there's no other woman in his mind. Can this be a side effect from his meds? He won't see his doctor and I think he is not taking it as he should be.