My friends never invite me?

[Helen]

Of course they're not ashamed! You've just drifted apart, that's all. It happens to us all, and it's upsetting.
If you miss them, and want to get back in the niche, then tell them how you feel. There's nothing stopping YOU from inviting them out now and then instead. Show them that you want to be a part of the group again. It might be that they think you're perfectly happy spending time with new friends.
But if you reach out and this leads to nothing, don't keep chasing after them when the effort isn't being reciprocated.
Whatever happens, this situation isn't your fault, so don't blame yourself.