Boyfriend is not in the mood for sex.

So my BF and use to have sex at least twice maybe three times a week. Now we only have it once a week. I did talk to him about it. He said that he is not in the mood that much anymore. And it’s frustrating to me because I’ve been super horny lately more than usual. And it hurts my feelings because it seems like his mind is on other things. It does make me cry sometimes. He said it’s not me but idk. I just really want to have sex! Also we are ttc and it doesn’t make it any better.