I'm going to go out on a limb here, but the fact you mentioned "I trust him and I know he loves me so I'm not worried about him doing something he's not supposed to" tells me the opposite. Either he has done this at some point, or you have some trust issues when it comes to him, or else, why the need to mention that in your post? And another thing I found to be a red flag was your need to get his attention, even if it's negative, by posting pictures that make him jealous. You need him to compliment you constantly. Why? Again, this goes hand-in-hand with your prior comment -- I am feeling some trust or insecurity issues from your relationship, but there's not enough of a history for us to go on. I just don't get the need for daily selfies that go out to the entire world. I could see a woman sending her friend a selfie because she is wearing the shirt her friend bought her and she wants her to see that. I can also see someone doing this for Halloween because they are wearing a costume and in the "Halloween spirit", but on a daily basis? Sounds like some extreme oversharing and need for approval from strangers. Not to mention, an obsession. I'm just saying, most people that are secure in themselves don't feel the need for daily compliments or attention, even if it's from strangers, as mamazita and Margie G. said.
I thought that B's suggestion was nice. You don't even need to go to a cabin, just spend an entire weekend without checking your feedback and posting. Can either of you do that? It'd be sad if the answer was no, considering how many thousands of people around the world do without Facebook just fine, but maybe that would be a wakeup call to you both that you're addicted to your devices and need to slowly unplug. I have to say, I agree with others that if you want him to stop with the electronics, you need to do the same. Practice what you preach, that means stop checking your Instagram selfie comments, and basically giving him the green light to also be in his own little word while the TV is playing. You may be physically together on that couch, but mentally, you're both in different worlds.
Why not discuss this with him and tell him that you feel ignored and want him to put the phone down when you're together watching a show, as will you? Designate at maximum, an hour a day while you're together to catch up on work, emails, and other mundane nonsense (like maybe while you're cooking, he can use his phone, and while he is cleaning up, you check yours), but the rest of the time, when you're together, you need to either be talking to each other or participating in activities together. If not, what is the point of having a boyfriend? Just to have a body on the couch? I don't know how long you have been together, nor how serious you are, but if he isn't willing to compromise in such a manner, then you have your answer as to the status of your relationship. Sounds to me like you both need to grow up, be adults, and lay off the electronics though, especially since they are taking a toll on your relationship. I expect this phone obsession from teens and 20-something college aged kids, not two adults playing house -- with the exception of doctors, lawyers, IT workers, or other people who may need to be on-call and have their phone available.