Hello im looking for advice on how to express my feelings without being a burden to my partners. I'm struggling a little with anxiety and depression, already seeing a therapist and working things out, but when it comes to my romantic and sexual life i feel out of control and like a total mess. I feel like failing at setting boundaries on my relationships and expressing my needs and desires, insecurity and intense feelings. It's super helpful to talk about those things but only if the other person wants to listen and be there with me, how do i deal with partners that do not want to know about my struggles? That only want to be around for the "nice and happy" things? I entered a relationship with a guy that seemed to want a full romantic and serious thing with me, but later on when we needed to talk about hard things like insecurity, boundaries, trust and difficulties we may have that harm the relationship he just went berserk blaming me for everything, saying things like he just deserves to be alone and that he just doesnt understand people but never wanting to get better in that matter and it just made it difficult to communicate with him. I don't know if i approached him the wrong way or not since he just flew away from me because he needed distance to let me go (we tried being friends again like less than a week). I just want to be better at communicating and establishing what kind of relationship i want or i can get with people. How do i ask those things or make that talk happen early in therelationship?

TDLR: how do i talk to people about what kind of relationship we'll be creating? How can i express my feelings in a healthy way without being a burden to my partners? If my partners dont want to know about it, how do I talk about that need or struggle with them? Would it be better to rearrange the relationship in that case so i dont feel a nuisance in their life?