To the weigh training question:
1. Have your measurements changed? Really, this is the BIGGEST question here because it's impossible to really give you good advice one way or another without knowing this.
So. A. You're losing inches. Then congrats what you're doing is working! I've had the same thing basically, I maintained/gained for a bit while lifting but lost inches. Your body tends to retain quite a bit of water in your muscles when they tear/repair during lifting so that's why right after a workout you might even look "inflated". Don't worry, it doesn't stick and it goes away over time. The weight does come off eventually but it can be slowly. However, you will look quite different even at a higher weight so it's worth it to stick with it.
Or B. You've gained inches/are the same. Then the first question is if it's your time of the month because of that's the case all bets are off and you'll probably weight more and/or even have gained inches. Note, this can also happen when you're ovulating OR right after a big/salty dinner. Are you weighing yourself daily? Did your weight just shoot up at the end of the month or has it been gradual? What is your meal plan like? Are you eating enough protein. Basically, I would need way more info here too...
Another question that's important...are you using the same scale to weigh yourself, are the batteries working and have you moved your scale to a different part of the house?
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Now, about your boyfriend.... I have to answer that because this set off a pretty big red flag for me. Why is he so caught up with your weight loss? Why is there a time limit on your weight loss? Does he watch too many weight loss shows like the Biggest Loser? Is he a naturally slim person that does not understand how weight loss works.
Unlike what you might see on TV weight loss is NOT fast, it is NOT consistent, and it is NOT easy. We ALL have our bad days, or slow months/weeks/YEARS, we ALL struggle. Honestly, I would've said something not very nice to your bf's comment

and it makes me wonder if he says these sort of demeaning comments to you in other areas too.
The thing is about weight loss is you always need to be working in the right direction. Some days are off, same for me too! Some days are easy but you have to stick with it and just keep trying new things if what you're doing isn't working. You can read quite a bit on 3FC and find that what works for one body does not work for another so it's not something as simple as pointing to person X and asking, "well, she can do it, why can't you?". There are an infinite number of factors that go into the female body: height, weight, metabolism, work environment, stress levels, sleep, exercise levels, general activities you do during the day, body frame, muscle tone. It's amazing we can compare AT ALL!
ETA: because I can't help it. People it's just a matter of semantics about the whole muscle "weighing" more than fat thing. Muscle is denser than fat, just that. For whatever reason the phrase "muscle weighs more than fat" has entered into the English language so even though everyone KNOWS that 1lb muscle weighs the same as 1lb of fat we also know that the volume of each of those 1lb's is quite different. There's really no reason to fight over it because it's just a phrase and I have a hard time believing someone out there actually believes that 1lb muscle>1lb fat...