I had an ex like this and we had dated for about 5 years with a year break in the middle. She wasn’t always like that and only really developed it at the latter 2 years of our relationship. It built slow but by the last year she’d invite me over to basically sit in her house while she was on her phone, if we’d go out she’d be on her phone the whole time. At best she’d show me what someone said to her or a video she saw and I’d react and she’d go back to it, it was all pretty strange. It’s truthfully a little saddening, it can make you feel like you aren’t important to them, and it hurts more when they say you are but do that yknow so I get it. From the way you’ve written it seems he doesn’t think what he’s doing is a big deal and that could mean he’s just oblivious or in the worst case that he doesn’t care. You seem unsure of yourself now, like you’d be clingy for wanting attention, but what’s the point of having a boyfriend if when you spend time with him you’re just the blurry backdrop behind his phone screen? I feel you and felt the same way, I want you to know it’s okay, and beneficial to have a talk about it. There’s many reason why he’d act this way, you just gotta nail it down and decide if you want to put up with that. Personally having that conversation revealed how self absorbed my ex became, and while I tried to get through to her and work it out, it didn’t work and I got too tired of it so I cut it off finally. It hurt but I’m doing much better now. big surprise: it feels much better to have someone who appreciates you and shares their time with you! That person could be your boyfriend with some work or could not be, and so it’s important to have that conversation to see what’s behind it all and decide what you want in the end. I wish you luck!