Fiancé playing with himself while I’m in bed

So sometimes my fiancé will want to have sex and I’m not in the mood. Or will want to go a second round and I’m just not in the mood. Anyway, if I say no, While I’m laying next to him, he starts playing with him self and I just feel the bed moving constantly. It just makes me uncomfortable & Is just a turn off to me. So I got off the bed and told him to do what he needed to do. Because that Is just something I can’t deal with. It literally makes me not want to have sex with him. And idky. Just needed to vent.