Mental health remedy for a better relationship

I go into these dark spaces (randomly) sometimes where I don’t want to talk to anyone. I’m in a relationship and my boyfriend obviously hates it. I’m not a very emotional person, meaning I’m not really governed by my emotions. I tend to let logic be my guiding light. So I hate when I can’t seem to control my feelings. I know communication is important but in those moments I can’t think past what I’m feeling. Honestly, I can’t even articulate exactly what I’m feeling, maybe a combination of: disappointment, sadness and feeling overwhelmed. I don’t know. Maybe I’m suppressing deeper issues and feelings? I don’t know. But when the moment passes I feel so silly. Like why did that even happen? And it makes me feel even worse because, how can I explain it to anyone when I don’t even know what going on myself? Does that make sense? Has anyone ever felt this way? Any advice? It would be greatly appreciated!