Angry and sad, need some advice

Hi, first time poster, long time lurker...A couple weeks ago my husband and I were making a photo calendar for a christmas gift. While we were going through his google photos we came across some disturbing pictures he had taken of our teenage neighbor. Her backyard butts up to ours and the photos are of her laying out by her pool in a bikini, standing around her pool in a bikini, and of her backside while jumping on her trampoline.

I was in shock and my husband was too, as he clearly thought he had deleted those pictures. They were taken on multiple occasions spanning an 18 month time period. She is currently a junior in high school so she would have been a sophmore in the earliest pics.. I dont know her age in years but in my opinion she is too young for a 46 year old man to be ogling.

I feel sick about it and I am leaving him, but he will get the house since it is his name and he lived here many years before he and I got together. It disgusts me to think of him living here and have her unsuspecting of his activities. I want to give her parents the pictures and put the ball in their court. These are people he has lived behind for 18 years and has a friendly relationship with.

I am too embarrassed to talk to anyone I know about this, I want to be rational but I am so angry and hurt and I feel so betrayed by the man I loved. Am I overreacting? He says every guy he knows does this and that hes asked people who said it was no big deal. Its a big deal to me though, and I really dont know what to do. Has anybody been through anything like this? Any advice is appreciated.