Resentment?

So hard to explain. My mil wasn't always the kindest to me, and I honestly felt ganged up on by her and my sis in law for the longest. It's always been that they are friendly to me, as long as I'm not doing better than any of them. Well.. For the last year I'd say we've all gotten along for the most part, mostly because i had been distancing myself, but I also know I haven't been my best self lately either. Sometimes I feel they are only being kind to me now because ive been down on my luck, post partum depression, weight gain, job loss, sis in law stole my business idea and ran with it (a whole diff can of worms) etc. But regardless of why they are being nice, it only feels right to reciprocate it or be accepting of it. It's been this way for about a year now but I'm finding it hard to accept. There is a lot of resentment there and that is def hard to fake. Am I crazy for feeling this way? It makes me feel like the bad guy in all of this because I'm hesitant to sweep everything under the rug and move on like everyone else has seemed to do. Am I being difficult? There's never been an apology or even an acknowledgement for the hurt and I still get serious anxiety when I have to be around them. Anyone else ever go through this?