ugh is it me?

so my boyfriend and I have sex like often,, but this is one of the times we haven’t had sex in a few days and we were having sex , he told me he came a lot , but I went to the bathroom and there was no cum nothing, and yea, it felt like he cummed but it was dry): I’m feeling upset because idk why he would like lie, idk ,, I don’t understand and I just want to know from a males perspective....no hate pls