Feeling insecure

So i wont keep you long.. i been with my guy 4 years 1 baby together. Before me he had slept with ALOT of women never had a girlfriend basically a fuck boy. I only slept with 4 before him. Hes over 100 bodycount. Look i cant help it aftwr the baby im feeling insecure n i find myself thinking about his past lovers... n comparing myself to them n trying to make myself better. My brains frazzled someone slap some sense into me.