I need all of my love experts out there for some help.

I have a girlfriend and we are a year in, her and her sister moved in with me. Her sister is jealous because she doesn't have a boyfriend, and she picks fights with my girlfriend. I have been used and cheated on 5 times before with my last ex going to a party and getting pregnant while I was out of town(that's another story), I live in southern Texas she took a flight to Ohio to see her dad before this whole thing started, she got back May 2nd at 10pm. As soon as she got back her and her sister got into a fight, I made her sister go to the other side of the house. To mke her feel better I Ordered her favorite sushi and burger, we watched her favorite movie, and I cuddled her the whole time, she fell asleep one me amd is still asleep on me right now. I want to plan something special to show how much she really means to me. But I dont know what.

PLEASE HELP ME