[M24] looking for advice: How to handle the Madonna-Wh*** complex and intimacy in a relationship with [M26]?

Heyyy everyone, so me (M/24) and my Partner (M/26) been together almost a year now. But we didnt got much into s*xual stuff.
Kind of recently we figured it is very possible to be the Madonna wh*** complex. Which basically means the opposite is seperated in 2 individual persons, the one and only Madonna who cant be s*xualized and well the Wh******.***
Our solution for now when we found out, was going for an open relationship.
So its been 2 Months now and it seems to work out pretty okay so far. We still be having an issues, for example i envy the people he sleeps with, since I do wanna sleep with him too lol.
So we did talk about it already and he agreed going to therapy at some point + he agreed to keep trying out stuff and see if that feeling continues.

So my question is, does any of you experienced something similar? If so how did you overcome that complex? Or what other solutions have you tried?
Hoping to reach out to the right people.
Tyvm for any advice.

TLDR: My partner (M26) and I (M24) have been together for a year, but we struggle with intimacy and believe it may be the Madonna-Wh*** complex. We opened our relationship to address this, but I am still struggling with envy. Looking for advice on how to handle this complex and improve our intimacy.