How to I learn to accept and love my “new” body

For some context I’m a young adult woman and I have experienced weight fluctuations basically my whole life. For about 4 years consistently I was on the bigger side. Not overweight but enough to be known as the bigger friend or person. Then I lost a ton of weight and became pretty thin. I started getting more attention and I liked how people didn’t think of me as the fat girl anymore. During this time I had a very toxic mindset of being skinny over everything and it was the only thing I really cared about. Once I met my now fiance we moved in together and we both gained a bit of weight. I’m not unhealthy and to be fair it is a good weight on me, I feel like a woman rather than a teen girl. It’s just so hard for me to break that mindset of not being skinny and fear of being known as a fat girl again. I have no desire or motivation to lose weight because I really don’t need to I know it’s very silly and the answer can seem simple but I just can’t seem to break that toxic mindset and cycle I’m in. I find myself being “good” with how I view my body and then all of a sudden it goes back to being bad and unhappy Any advice would be helpful