how do I handle thi

About a month ago I posted how my bf was passing up a dream internship for this summer. He wants to go into a federal job and the internship was based in Washington DC. It's not far from us (3 hours, so I could easily visit/he could come home on weekends). It's only for 6 weeks and they have housing and he would has his own room and a roommate. He didn't fall out the form to agree to go and I didn't understand why. He's not doing anything else this summer besides working a summer job where he could make more money going to D.C. I talked to him today (like serious talk) to find out why he didn't want to go. His reason is because he's too scared and comfortable with how life is. Before we met he was sooo shy but he has grown out of that. Idk how to help him since he says he's and at himself for being like this. Do I keep encouraging him to branch out, do I give him time to figure himself out???? I am moving in august and starting at a new school in a new city. I am not scared but excited how do I help my bf be like this?? My friends think I need to let him goes because I'm the type that does crazy stuff and always needs to do stuff which isn't him? Do you think he can grow out of this? I just don't want to date a guy who lets life pass him by!!