Are you good at blowjobs? How long did it take you to make your bf/husband finish?

Okay maybe a weird question but guys...I’m struggling over here.

Before my current boyfriend, I thought I was pretty good at giving blowjobs. I’ve given 3 other guys head before and all 3 finished and said I was great.

But with my current boyfriend, I’ve only ever been able to make him finish once and we’ve been together for 4 years (we were long distance for the first 3 years tho). It’s really frustrating because Idk what I’m doing wrong. I’ve tried all the tricks in the book and nothing. The one time I successfully made him finish was super random and I wasn’t doing anything special and I’ve never been able to do it again so Idk.

Will I just never be able to get him to finish again? Does him masturbating affect the chances of me successfully going down on him? He says he’s just too used to his own hand since that’s all he had the three years we were long distance lol. Anyone have any advice on what might be going on or what we could do? Like I said, I’ve tried everything as far as technique so I’m at a loss at this point.