relationship advice needed...please?

have any of u had a long distance relationship? did u ever get insecure feelings about it? if so whats ur advice?

reason i ask is im dating someone pretty damn far away.... and i really care about him and he really cares about me.. but i still get feelings sometimes when he doesnt answer his phone or a text or something that he might be out with another girl... and last nite he went out riding (motorcycle) with a friend and told me hed text me when he got home.. but he didnt. so i texted him this AM to see if he was ok and he texted me back an hour later saying sorry, im home. and that was it. so i dunno....and i keep telling myself that im being retarded because i honestly dont think he would to that to me. so i need advice on how to get rid of the upside-down feeling in my tummy.

thanks ~Una