Not sure why some posters here are sceptical of what your saying. Maybe you need to specify a bit more, but I know what you mean.
I think what you might be finding out is that your partner is that your partner either doesn't need a relationship as much as you do, or that he doesn't enjoy or need your company all the time as much as you enjoy/need his.
This is why I tell people that you don't really know someone until you live with them. Sometimes people live apart and their relationship living together just happens to be exactly what they imagined, but other times, living apart can really hide a lot of important detail that could have been deal-breakers years ago.
For people who just aren't as interested, or who are more introverted, you might not realize that they're like this until you actually live with them, but it depends on your circumstances. Even if you see someone 2-3 times a week, it's still not the same as living with someone all the time. I don't think you have their undivided attention in quite the same way. Since they see you so much, there isn't as much need for them to focus on quality time that previously would have had a timer on it.
I'm sorry, but you need to stop convincing yourself that he loves you because although that might be true, you have no way to quantify that. You have no way of knowing how much he loves you or if love even means the same thing to him as it does to you. The only thing you can ask yourself is 'Do he behave like a man who loves me?' What are his actions telling you? Most people scroll through their phones when they're just occasionally chilling out on the sofa or bed, but if it's now happening all the time, and if you find that absorption unattractive, if you feel regularly ignored, then that's not good.
I'm not sure if he's actually made much space in his life for you OP and you're only finding that out now. When you have a romantic partner and if it's serious, it's inevitable they're going to take space and some people just don't want to change their lifestyles to accommodate that, so they expect their partners to accommodate them.
However, it would be good for you to outline what your expectations are in a relationship because there a fair bit of missing detail here , like what his hobbies are, and how many hours socialising and hobbies are taking up in the week.