It is a PROCESS!! Your chances of keeping it off are GREATER, if you lose weight SLOWLY. In addition, it needs to be a LIFESTYLE change, not just about a "diet" - a four letter word I don't allow my clients to say. It takes TIME to figure things out, what works for you, reading and understanding labels, making new, different and healthier choices, getting the family on board, etc.
You REALLY didn't talk about what you are or aren't doing. You HAVE to change your exercise regime, making it harder, changing the type of cardio, etc. in order to get results. You MUST be in "overload" in order for training to take effect. If you are going thru the same routine, same way, at the same intensity level you were 6 weeks ago, you're NOT working up to your potential and thus your body is not going to burn calories if it's not difficult enough.
At LEAST the last 3-4 reps should be HARD. Change the type of cardio, change the intensity of some of your cardio, use stairs at home, if you have them, doing short bursts of intense intervals.
What are your eating habits like? Sufficient amounts of water (1/2 your body weight in ounces at MINIMUM), eating at least 5-6 times a day, eating at least 5-8 fruits and vegetables daily? You CAN change your metabolism just by doing many of these things. Skipping meals and limiting your caloric intake will only SLOW down your body's ability to burn calories. It take a MINIMUM of 1200 calories DAILY for the body to function.
If you are losing weight, even slowly, then you ARE moving in the right direction. I do ALOT of compound movements with my clients - lots of "multi-tasking" when it comes to exercise. i.e. lunges with overhead presses - LOTS of muscle recruitment/calorie burn, change an angle to make it more difficult, on a ball, on a Bosu, etc. Make SURE you are maximizing your time and effort.
Rather than look at how slowly you are moving in the right direction, ask yourself how you can better maximize your time and effort. What things do you need to change/tweek to make a difference. Little changes DO make a big difference.