The worst thing you can do in a relationship is deny your pain.
That said, I need to ask some questions to gain a better understanding of your situation.
What’s the age gap between you two?
How long have you been together?
What exactly do you mean by a long term relationship? Are you married?
How long have you been feeling this way?
No big dramas? Okay tell me about the small dramas. Those “small” things are often the silent killers in relationships.
You asked “Is it possible to be in a “good” relationship that’s actually wrong for you?”
That leads me to my final question. If you had to paint a picture of your ideal relationship, what would be different?
Your answers are gonna tell me everything I need to know if this is a normal relationship slump or a deeper sign that something is fundamentally missing?