Can't orgasm like I used to...

So I have sex with my boyfriend like on at least one day of the week and he usually gets me to cum first through clitoral stimulation but these past 3 times I haven't been able to reach orgasm. He's doing everything super perfect and I get right to the end and then right when I think I'm gonna cum it doesn't happen. I've only been orgasming through penetration lately. Im okay with that but still... I feel so deficient cause I can't orgasm from him fingering, or eating me out. Not even 69.. It's weird and frustrating.