Though he enjoys being intimate, I just feel like it's unfair that he can never finish. Dear Reader, Given the situation, it's understandable that you may have feelings of inadequacy. Your lover may be having this experience for a number of different reasons that likely has little to do with you. Therefore, it's unfair to compare him to your past partners.
Every individual responds differently to sexual pleasuring.
Some people become aroused easily and are able to orgasm without much effort. Other people take longer or have difficulty orgasming. Express to him how the situation makes you feel. Find out how he feels. Perhaps you'll find out that he's sexually satisfied even though he doesn't climax.