Eh it's not a crime to stay the same weight when you're not "at goal" yet. Don't lose sight of that! Just like, you know, don't associate healthy food with being "on a diet" and revert to nothing but crap junk with no nutritional value, but I don't think that's in the cards.
Partying is great, especially when you're freshly single and looking for drama-free fun with friends. Just being out with other folks your age is really nice, even though with that comes the omnipresent obnoxious stupid people who should really not be allowed in public. I saw you had some plans coming up - make the most of them and get invited to do more stuff with them/meet their friends/you play the upper hand and make plans for the next hangout.
And you're totally gonna be over this breakup before you know it.