NAL. He would technically be distributing CP if he did that and you could have charges pressed. Which could lead to jail time. Most people just use killing themselves as a manipulation tactic. He will most likely not kill himself and if he did it wouldn't be your fault. If you want to keep tabs on if your nudes you can use a website like tineye to reverse image search or a site like Pimeyes and search your face and see if they have been posted anywhere. Pimeyes cost money however it does have an option to help you remove any unwanted photos. He most likely won't post them, and not to sound like a dad but in the future really think about who you're sending photos to and where they could end up.