I don’t even know where to start....

it’s been a while since I’ve self harmed. I have a boyfriend I’ve been with for 4 months now. I talked to him before about self harm and he said that he wouldn’t want to be with me if I did and that it’s so pointless and stupid. Which it is. But at the same time it’s all I think about whenever I get so mad or upset. I don’t really have any friends to talk to. The only people I talk to about my problems are my mom and my bf. But when my boyfriend and I fight I feel so alone. I love him but we kinda fight a lot over tiny things. it tears me apart. I don’t wanna read in the comments to leave him because everything’s perfect besides the fighting. And my post isn’t about that. But when we argue I get so mad that I feel like screaming. And whenever I want to self harm I get a tingling feeling in my arms that won’t go away. I want to hurt myself so bad but I know I’d regret it later plus he’d see it. I just don’t know what to do....