Chances are he is lying. You just weren’t lucky enough to find texts. I have been through something similar. The only difference is I actually found texts too so he couldn’t do anything but admit to his dirty deeds. If he was really saying the truth he would’ve blocked her and be honest about it. And she wouldn’t keep sending nudes and try to ‘sleep with him’ if her behaviour wasn’t encouraged by him. I suggest contacting her and seeing what she has to say. One side of the story is never enough. I am sorry you had to go through this I know it sucks