<human>: Can you give me a shortened version of the text?

We have been together about 15 months, and have lived together for 6 months. I am 4 months pregnant. 
 I'm not Luddite, I love my phone and checking social media and reddit, etc. But his phone literally never leaves his side. He sleeps with it, it's always in his pocket or in sight. He scrolls through Facebook, Instagram, and fishing forums and texts all day everyday. He does it during dinners with me, but also during dinners and get togethers with family and friends. He spends more time on it than off it. Immediately after sex, he picks it up before doing anything else. 
 When I have confronted him about it (many, many, many, many times), he usually argues that it is harmless and I'm just nagging him. I have left because of it, and when he begs me not to leave or begs me to come back he promises to "fix it" which usually lasts a few days then it's right back to it. When I bring it to his attention he says things like "I'm just reading a text message" or "after this video I'll put it down". It's gotten so severe that I am embarrassed to bring him places and want to leave but me being pregnant complicates things. He's a pretty great guy outside of this addiction, which has been a problem for at least 9ish months. 
  What do I do? Is this a genuine addiction?
<bot>: My boyfriend is a great guy and will be a great father to our soon to be son, but he is hopelessly addicted to his phone and it's ruining our relationship