He claimed "nervousness"
Idk what to tell you ....the whole thing was dumb, but he was a frequent porn consumer and it took about 6 months for him to admit that could be the issue.
Never really figured it out, never experienced anything like it before or after him. Could have just been incompatibility but

death grip is real and nikkas aren't trying to go "no fap" for no reason.
If I still cared it would be a good one for couples counseling but once the majority of your sex life with a person is about the lack thereof

it's hard to recover or build attraction