Does this mean that wat i am doing feels good for him?!

Sometimes when my bf and i r making out, i like to make it a little defferent and start gently rubbing his penis area when hes hard. he usually tells me that "it feels rlle good" and if i stop, he nicely asks me to do it again. Then, sometimes, he puts my hand right on his penis (skin to skin) to tell me that he wants a handjob. Question 1.) is it bad that he has to be that obvious? should i take the signs when he tells me that rubbing it from the outside feels good to him? or is it good for him to want it? also, whenever i give him a hand job, he does not want to come. he says he feels bad for getting ejaculation on me, even though i have told him so many times that it is okay, and i actually kinda think its sexy. Question 2.) what can i do to make him stop being emberassed? and... one more question... whenever he does come, he stops breathing for a few seconds, and his whole body tenses up and he shakes, kind of, i dont really know how to explain it... it is almost like he is curling up into a ball... i dont know. haha. Question 3.) does that mean that i am doing a good job, and that he likes it? does anyone have any tips to make my HJ's any better?

thank you SO much and i REALLY appreciate you answering these questions for me. and by the way, I am 23.