I wonder, LW 2, if your problem is so much that Son is constantly in contact with his father - as that you aren't.
You don't state it outright so it's hard to say but it feels like there's kind of a subtext here that you feel like you aren't getting as much time with your partner as you want to, and you resent that the son can have as much time as he wants. Even if that's not what you're feeling, I wonder if it would help if you did have more casual checkins yourself. Do you feel like you can text or call him whenever just to chat? Do you ever do that? How does he respond if you do? Have you ever talked about that part of it?
He'd almost certainly be more receptive to "I like our life now but sometimes on the days we don't see each other I feel disconnected, so I'd like to call more and know you'll be happy to chat" than "I feel like I'm always a third-wheel to your son, please stop answering his calls".
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You don't state it outright so it's hard to say but it feels like there's kind of a subtext here that you feel like you aren't getting as much time with your partner as you want to, and you resent that the son can have as much time as he wants. Even if that's not what you're feeling, I wonder if it would help if you did have more casual checkins yourself. Do you feel like you can text or call him whenever just to chat? Do you ever do that? How does he respond if you do? Have you ever talked about that part of it?
He'd almost certainly be more receptive to "I like our life now but sometimes on the days we don't see each other I feel disconnected, so I'd like to call more and know you'll be happy to chat" than "I feel like I'm always a third-wheel to your son, please stop answering his calls".