I need serious, hopefully Christian responses plz...?

I have long distance relationship w/ my bf for almost 3 yrs; we met on reputable online dating site. He is a wonderful guy & we get along in many ways, but I'm afraid the distance is driving us apart. We live about 800+ mi apart. We've only been able to see ea other twice in last 9 mo.In beginning we tried to see ea other @ least every month or two. He is under a lot of stress @ work w/these complicated IT projects in a medical business. We don't get to talk as much either, & if I sumtimes ask about our relationship, he gets kinda mad, like saying, I'm doing the best I can! What do u expect I'm so busy! See, he was sup to be the 1 to move down here to live but who knows when that's gonna happen. I'm 34 & he's 30. I want things to work between us but feel I can't wait 4ever. I feel like giving him a timeline to make a decision 1 way or the other but I'm afraid he might call my bluff & break up. We got into this relationship w/the premise of looking for sumthin serious & marriage, so its not some fling. I don't wanna throw away 3 yrs but I'm not gettin any younger & would like family 1 day. Thank u 4 all who read all this & plz give serious answers. I love him & he's a good man, but is there a time limit?