I see the weight creeping back. Need support from those who understand

Hey all! Its been years since I posted on here. Im a 5'6 female age 25 currently weighing in at 136 lbs. I previously went from 155 down to 128 ish over the course of a year in 2021-2022. I stayed super active and was able to eat in a way I felt satisfied. Fast forward to now and I am having a way harder time motivating myself to work out. I moved into my own place, got dumped, and have been dating someone now for about a year. This has brought on a lot of fluctuation. I was down to 120 after the breakup, so we're looking at a 15 pound weight gain in about 1 years time. I dont want to to back to how things were. Has anyone seen the scale start creeping back up? What'd you do? How does one motivate themselves to keep exersizing? I did just get back from vacation, so im hoping that is influencing my weight and it will come back down. I also work a more sedentary job than I used to. Its a 9-5 that I try my best to fit exersize in between. I've feel like ive traded all my discipline and good habits for a way better social life.