Make him feel better

So the last two times me and my SO have had sex I never got to finish and he always waits for me to finish before he cums. Well since those two times he's been feeling like if I'm not interested in him anymore and that maybe someone else has my attention. But I reassured him that not one else has my attention and that i don't know why I didn't orgasm those two times. I only orgasm thru clitoral not vaginal. And the times we had sex I was really into it just it didn't happen  idk why. Any ideas on how to make feel better? Feels like I made him feel not worthy of him finishing me off.