What does a supportive / healthy relationship with a SO look-like?

I was raised by a NM and EF. I feel like other than the unrealistic relationship standards we see on television and social media, I've never been around a 'normal' / healthy / supportive SO.

Sometimes I feel like my current SO is showing he is one and other times, I feel like he love-bombs and is hyper-critical and demeaning to me.

I find it all so confusing, whether it's all in my head and if I'm the problem (like he says). I'm guarded and not great at communication. He says I can be 'cold', yet I'm too sensitive.

I'd love to hear from those who found someone who is loving and supportive of you as a person. What does a relationship like that look-like?