Cumming / Orgasms

Hey guys,
I just wanna know if anyone else has experienced this or maybe knows what might be going on... 
So normally when my bf and I have sex, we start with me sucking him off and then him eating me out to the point where I climax (keep in mind, nothing comes out) and then he fingers me and fucks me. When he pulls out, there's a white substance on his dick. He claims he didn't feel himself go (I didn't feel him go either) and he says it's not sticky or clumpy like his cum. So I'm wondering does my cum just get jammed up there and that's why when I climax I don't cum or is that just some sort of discharge? 
I really don't think it's his cum... I just wanna see if anyone else has experienced anything like this?? 
Thank you ✌🏻