Sending nudes

I have been with the person that I’m with for a while now and he has seen my body multiple times and pictures and in person. Sometimes since we don’t go to the same school and don’t live very close to each other to get in the mood I’ll send little teasers to him but he often now doesn’t really respond in the way that I want. Sometime she just completely avoids what I just sent and doesn’t acknowledge it or he’ll ask for a little picture but he won’t respond The way he used to. Now I’m very athletic person work very hard for my body and so sometimes I feel insecure when he doesn’t knowledge what I send or does it have a certain reaction like he used to make me feel like he is bored. Am I overthinking this or or is it a valid reason to feel unappreciated and slightly insecure? And I have spoken to him about it but he doesn’t seem to really have an explanation.