I really like my boyfriend and may even love him, what can we do other than actual sex?

Try rotating his penis in small circles while you're pumping slowly. Let your hand send pulses of light pressure also. Try spitting on it as a natural lubricant. Since you are unwilling to perform orally yet this may be an okay temporary substitute. Don't forget to lightly fondle his testicles. While he is pleasing you, try to lightly tug at his hair on the back of his head or scratch lightly at his back or chest. If he enjoys this keep it up to signify when it feels really good.