Hi Petra1115 and another

from me, too.
Finding balance (not overselling how great the relationship is, not venting to everyone all the time) without
invalidating ourselves ("it's not that bad!"), like EyesUp mentioned, is key... and maybe easier said than done at first!
I'm wondering if untangling who in your life you tell what to, could be helpful.
What I mean by that is that sometimes even if we're trying to be skillful and balanced, the people in our lives are real human beings who care about us. Family dynamics often have a loyalty/"blood is thicker than water" component, so when we're telling our family about our romantic relationships, even skillfully, family can sometimes take a "nobody does that to my sister/brother/son/daughter" stance.
What would it be like if you had a counselor or therapist to kind of unload to -- the full range, positive and negative? You might already have that, sorry if I missed a mention.
And then you could find a way to balance honesty with not over-sharing with family/friends who may not be able to also be skillful. In a way, it's understandable -- they love you and want to be "on your side", and of course it's difficult to watch a loved one struggle in the middle of a journey. Yet it's your journey and them thinking "you should be at point Z", while good information to consider, doesn't change that you're at point B right now.
It could pivot conversations away from the unhealthy triangulation of you defending your partner to your support system:
"Mom, thanks for asking how we're doing -- we do have challenges, and I want you to know that I'm talking to a therapist about that right now, so I have great support. It would mean a lot to me if when we're together, we focus on you and me; I'd really like that if you're up for it -- that would feel supportive to me"
This takes you out of the "rescuer/defender" position on
the Karpman drama triangle where you feel like you have to "make excuses" about him to your family, and it also takes your friends/family out of the "persecutor" position where they feel like in order to care about you, they have to show you how bad he is for you: "I'm right about his toxicity, why can't you see it".
It may be true that he has unhealthy behaviors, it may be true that you are working with those and aren't open to a "stay or leave" conversation -- the healthier way to structure those discussions could be pulling it out of the unhealthy triangle and putting topics in their own lanes.
Balance could look like keeping those close family and friend relationships which are so critical to your basic well-being, but having deeper discussions with a therapist/counselor.
It's one idea to brainstorm -- there could be a lot of ways find a balanced, validating way to negotiate your romantic relationship and your supportive relationships, so this is not the only path forward.