Am I overreacting? Advice needed!

So after having 2 babies pretty much back to back, I feel pretty disgusting in myself & have quite low self esteem
I’ve just found out my partner has reddit solely for looking up nudes, uses tiktok to search for hot girls & Googles onlyfans leaks
Despite always telling me he doesn’t need or use porn because he has me
At I overreacting or wrong for feeling incredibly hurt & betrayed over this? Don’t even know how to begin talking to him about it