*Check your privilege* (message to self) So glad to NOT LIVE WITH MY PARENTS. It's been... 25+ years since I lived with them. So I will happily acknowledge THAT consideration didn't actually cross my mind in this thread.
A few thoughts:
Do you have a plan for when you are moving out (after school, after saving a specified dollar amount...)
If so, are you working on that proactively in a way that could help your partner see the progress more clearly?
I say this because for me, if I know something is coming, even if it's OUT THERE (like moving in 2017 when I graduate), and I can "tick off the steps"-that REALLY helps with insecurities, frustrations etc "in the heat of the moment" when they arise.
This may be something you can really work on with your partners so that they can see that progress in the hard moments.
It's awesome that you are out to friends. Is it possible that you could help D become more intricately woven into your social group even though he's distant at the moment? So that your friends could also be his friends? I find that one of the things that really helps me in moments of feeling unsure in my marriage is the ability to call my father in law or brother in law ON MY OWN to talk or hang out. Just having MY OWN link to that social network helps me feel connected even when Maca is unavailable.
Likewise, going to school with GG's best friend, seeing him in class, talking etc, helps me feel connected to GG even through difficult times AND I LIVE WITH both of my guys. But it's still very helpful.
Maybe being able to become more involved (even if online or when visiting) with your social group, could help him feel more involved in your life.
ESPECIALLY if he's going to move there-he won't know anyone else. That could be a good "in" to meeting people HE likes, even if they are friends of friends of friends.
Are the guys interested in getting to know each other better? Is it possible (as friends) they could make plans to have some "guys time" to hang out when D is there, or talk online/on the phone or anything? Play an online video game? Something to increase their social interaction?
As for why I haven't introduced D to my family...it's complicated. I live in a rather conservative area of the Midwest (ie. when someone found out I didn't go to church, I got a "I'll pray for you"), and I currently live WITH my parents. Also, my parents had never met D before and I suppose it would've brought up questions I really wasn't ready to answer for them. I know already that my parents aren't exactly supportive of open marriage/relationships ("if you ever get a 'friend'...I don't want to know"). I would love to be able to tell them, and I plan to, but I feel it's something they need to be eased into.
They'd never met D before, given how far away he is. To suddenly bring him over and say "this is my boyfriend - I have two" would not have ended well. Granted, I regret not at least introducing him to them. I am also an only child, so I know my parents are fairly protective.
As for why they know about C...wasn't for lack of trying. I'm fairly private and I tried to call him "just a friend" for as long as I could.
Now when I finally get the chance to move out, this will all change and I'll have more freedom concerning what I feel I can tell them. And I'm not going to hide D forever (that's just rude), but I just need to ease them into it.
I would like to mention that at least 50% of my work and 100% of my friends (irl and internet) know that I'm poly and know about both D and C. It's not like I hide D otherwise. It's only to my family, and mainly because I still have to live with them.
I just want to be clear that I do love D, and want this to work.