no reply when I send nudes

My bf and I have been together 2 years. We are both 21 and he was my first time. He always tells me how much he loves my body but now and then I'll send him some compromising pictures in my underwear or even fully naked on snapchat and he just doesn't reply! 
I don't know if I'm being overly sensitive here, but if I trust him enough to send him pictures despite all the insecurieties I may have, I at least expect him to compliment me or at least aknowledge them! 
Should I tell him or just get over it? or stop sending pictures..?
Note that he does reply to many of them and seems to really like getting them!
EDIT: I love him, he loves me too and have no doubt I can trust him.. also we have been in a long distance relationship since September last year.. that's why sending pictures matters.. 

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