I haven't met his teenager after 3 years

[Nousernameforluvnormoney]

I've read posts similar to this on forums before but would still like some thoughts please!
Began dating my partner 3 years ago. We both have jobs and see each other only at weekends, where he interacts with my children every other week when they're home and not with their dad. He's always maintained that his son has stayed with him since his split 12 years ago when the boy was 2, from midweek until saturday evening, when he takes him home. However, he said from early on that the lad was never a sociable teenager and wouldnt be expected to meet me.
Fine in the early days but now he says his son is nearly 17, at college and attends a rail volunteers centre every saturday. So he is clearly overcoming any problems he had socialising before.
Friends say alarm bells should be ringing and i am baffled. When his son texts for a lift, often after a train journey on a sunday, it is sometimes more convenient if we picked him up in the car together if we're out, but no. I get dropped off and then he goes to pick him up.

I have met one of my OHs children. The other doesn't want to meet me, so I understand how you feel upset that your OH won't push for you to meet, especially since it sounds like it would make life easier all round.

No one is asking his son to be your best friend, but to be able to sit in the car together for a short journey would surely make more sense than having him wait in a cold train station for an HOUR!

I would like to update my thread . Hard to believe it's been nearly a year. I have continued much the same all year. Haven't met my partner's son.
In September , I saw my partner tagged on fb at his younger sister's wedding in the lakes which . Asked him did he know she'd been married. He said yes he was there , the previous day ! First I'd heard. Obviously I said I understood as blood is thicker than water etc . He said he didn't mention it as he didn't want me missing out ??
This week he mentioned on wattsapp he'd dropped his son off at home and her bf's car was outside .
This played on my mind and I ended up asking him the next evening on wattsapp why his son was discriminating against me ? His mother has had 3 men in the years I've been together with the boys dad but I'm a no go area. His response was that in the beginning he heard me swearing at my son who was then.18 . I asked was he ashamed of me ? He said he didn't want his son exposed to that .
I got upset and haven't spoken to him since . He told me and my younger children that his son was an anti- social teenager and blamed him when it was his own descision all along . Plus his own past isn't great . Compared to him , his ex and my own ex I'm an Angel !
I've never harmed anyone and this is what I get . To feel not good enough .

He clearly never saw you as part of his future op. Think about it. A relationship progressing involves integrating all parts of your life - children being the most important. He kept it this way for 4 years. He never saw a future with you.
He didnt invite you to his sisters wedding ? Doesnt that also ring alarm bells for you. He is keeping you separate from his actual life.

He sees you over weekends, his family and child are separate from you. Sounds to me like you are his side relationship when he probably is involved in a serious one at the same time.