Can i eat 1 small meal a day and loose weight?

For some reason the past week or so I have not been as hungry. I got a new gf and idk things are different. I have been use to fast food once maybe twice a day and in the past week and a half I haven't had any. I have been eating like a small breakfast and not eating nothing all day. I stay up all night and go to bed at like 8 a.m. wake up at 2 go to work and do the same thing. I'm like a 17 year old 260 lbs, male.... but I have lost my appetite lately. Is it because I really like her or is it tht I am not hungry. Please let me know I wanna loose weight so I figured I could cut back some