How long has this lasted? It's not really a plateau unless you are losing less than 1/2 pound for over a month generally. Weight loss isn't linear, so there are times it will just slow for whatever reason.
I have had several plateaus along the way. Some were a little self-induced
Some just were for whatever reason - and those are the most frustrating. I have a bit of one going on now, but really - what is your alternative?
You can give up and gain back the weight (and more), or you can view this as what a healthy lifestyle means and how great it is for your body to have good foods and exercise, no matter what the scale says.
Patience is the true key to weight loss, patience and perseverance.