Advice?

Rae
I'm fit for my body. I'm not thin but I'm not overweight I have an athletic body. I take care of myself. I wear cute clothes. But why does my boyfriend not want to be intimate with me? I know some times he is tired but when we started dating it was non-stop. We both would pounce on each other now it just seems like I'm the only one doing the pouncing. Its been a good 2 going on 3 weeks since we have last been intimate. What do I do