Do not—I repeat, do not—drop this bomb right after he’s just brought you coffee in bed. That’s just evil. Also, avoid times when he’s hangry, exhausted, or mid-game. Instead, find a neutral moment. Maybe a Sunday afternoon while walking in the park. Someplace where you both can breathe without the TV distracting you. (You want his full attention, not his half-attention while he’s wondering if his pizza order arrived.)
Ironically, the worst time I tried this was during a road trip. Try saying, “I need a break,” while he’s merging onto a highway. Spoiler alert: we almost broke up with a semi-truck. Pick your moment wisely, friend.