Why did he almost cry after had sex and why was he so nervous?

this guy and i been hooking up for almost 2 years now and there's things i don't understand about him at all. he had a hard time buttoning my shirt (he likes dressing me up before he undresses me) because he was shaking he was so nervous. we talked about all the positions we wanted to try but he came during the first one. his face was red and he looked depressed like he was going to cry. then he got offended when i started to get personal and asked what was wrong. is there a reason he was so nervous and why did he get upset when he came early? thank you!