How do you deal with Stress in a Relationship?

My boyfriend is A Leo

And I'm a Libra and How I deal with stress is Wanting to Be Alone. Mom passed for 1 Year and it's gonna be 2 years since she passed and its those days that you just want to be alone and grieve By Yourself. Boyfriend cousin passed yestersday and he's miserable so he looks for Negative shit in the relationship and we both argue. I'm Very Moody at this point. Sometimes I feel like I don't even want to be here anymore.