I am also 5' 2" and not currently at my goal weight. However, when I work out, I definitely look much better between 120 and 125. If you put on muscle, you will look awesome at that weight. It sounds high, but with muscles and low bodyfat, you'll be making the ex drool, and kick himself for letting you get away. And that's what we all want right? hahhah....

Good luck, you can do it!