Lying to my SO

Nathaly
So I'm sexually active with my SO and every time we're done he cuddles me and all that fun stuff and then asks me the question "did you come?" And every time I say yes but in total honesty I don't. And I feel bad cause I feel like I'm not being honest. I know this isn't so bad but I still fell bad. Should I tell him the truth or keep it hush. Cause I feel if I tell him the truth he will feel pretty bummed out like he's not doing his part right. So i don't know what to do.