Help me be a better girlfriend

I am extremely insecure and I suck at being in a relationship

I am a very free spirited person. I’m not used to being told what I can and can’t do. I’m not great at being romantic or expressing my feelings in words. I just suck. And it doesn’t help that I contradict myself by being extremely clingy, insecure and low key psycho jealous.

My last relationship, I was very independent. Was never jealous and kinda didn’t gaf. And I was not as emotionally invested and neither was he. (Later found out the man was cheating on me so that would be why lmao)

My man now. Is extremely emotionally invested. He Is a dominant and jealous man. He is romantic and needs reassuring that I love him.

I am insanely in love with this man. But i don’t know how to express it. Someone please help me express romance and love cause ya girl out here dying.