I need help? Idk what to do. I’m a 23M & she’s a 22F and ik my thing works but idk I do love and care about her

So I’ve been sleeping with this girl for 7 months and I’ve had sex with girls before but a lot of girls don’t make me cum but the ones that do make me cum so much and constantly Everytime. When I have sex with her tho it’s hard to cum unless I go super hard and we got into an argument bc she wants me to cum faster then that but I just can’t.

I also told her like it’s not as tight and it’s not super wet until I go hardcore/super rough. But she exploded & got mad and was just like well go find someone else but she don’t want me to fuck no one else u used to beat off a lot so I’ve been trying to ejaculate with a softer grip to make it feel like her but ngl my brain was super dry trying to jack off like that and tbh idk what to do, I came 3 times by myself last night it took a 15-25 min while watching 🌽 and loosing the grip, I’ve cut back in masterbating bc the sex has died down over the last 3 months with the aspect of how good it was.

Lots of arguments & stress & just no energy like idk what else to do…