Stellart, I live in a foreign country with almost no friends. My boyfriend is less social than me so I'd say he officially has 0 friends. But the jealousy I had started back home. We are totally enmeshed and co-dependent and spend all our time together. All his friends back home were mostly women because he's just not a guys-guy. I would feel jealous and I think he could tell so he hung out with them less and less. Now he has no friends here and almost no friends left back home and I feel really bad. In fact I'm always suggesting "Hey you should contract Kristin... see what she's up to." and he replies "Nah, I don't even like her."
Being co-dependent really put a strain on our relationship when we first got here. We really are each others' only source of entertainment! But within that pressure cooker, we both really found this new drive to improve ourselves (or I did and told my boyfriend and he said "Yeah, sure, new hobbies, new friends, sounds good.").
My plan is to pursue some goals or interests that have long been on the back burner. For me that is making weight loss a number one priority, finishing my Master's (started 6 years ago!), creating art and pursuing writing. While my boyfriend lost his friends thanks to co-dependence, I lost my hobbies and interests. I am also smiling at people more, going out to events that seem even remotely interesting (everything from regatta races to yoga classes), trying to talk to people more.
It's not a perfect system. I've met 3 people in the last 2 weeks and made friends with them on Facebook. I sent them all a what I thought was witty message and an invitation out for a drink sometime soon and got no replies. It makes me not want to try but in my situation, I HAVE to try. I have to make friends, even if it's with people who aren't my A-1 choice, just for the betterment of my relationship. It is amazing in my friends pursuit how much I like and appreciate my boyfriend more.
Would you be willing to meet friends on the internet? When I moved to Minneapolis I went around for about 4 months friendless and finally turned to the internet, putting out a platonic ad on craigslist. I met a bunch of cool people, most are still my friends now (albeit very very far away now...

). I'd totally do it again but Busan/Korean doesn't seem so hooked up on craigslist. Also, I met a ton of cool people volunteering at this little radio station (and the gig was fun too). My friend just moved to Chicago and has struggled to make friends. She just joined a improv comedy theater and has met a lot of cool people.
I think you if you put yourself our there more and especially concentrate on some interests you have, you'll feel less dependent on your boyfriend.
but then again, if you only see your boyfriend twice a week, that sucks if he cancels one of those days. Can you have a make-up day during the week? Then you won't feel like you're getting shafted.