Need relationship advice!!

So, my boyfriend and I have our first daughter together she is 3 months old. Well I’ve been suffering from postpartum depression and he doesn’t seem to understand how it’s possible (that’s not the advice I need). Him and I have drifted apart from each other, he moved into my parents house with me, well when I’m out doing grocery shopping etc , he masturbates... I only found out because I have a camera in the bedroom for the baby. I have told him it’s disrespectful to do that especially in my own bed , and my parents house. But he keeps doing it... and it hurts. Our relationship is pretty much over. But am I over reacting this? Or... is he the one in the wrong?