I know we're both to blame, but who is more to blame?

I'm gonna warn all of you its a bunch of Facebook drama so here goes. The past week was filled with drama. My mother in-law misunderstands everything i say and gets really upset. Last weekend I was supposed to see a movie with my husband but he had to go to his parents house to cut the grass. it was the least he could do since they spotted him some gas money since his job doesn't pay that well. well i was upset because my mother in-law and sister in-law were going to the movies that very exact day my husband had to cut the grass. They didn't invite me but kept talking about it like they were rich big shots because they have money and my husband and I do not. Later on i post a status on Facebook to rub in her face. It said, "when i get a job my husband and i are gonna go to the beach and no one and no financial troubles are going to ruin our plans." then i put up that i miss my family (because ive only seen them 4 times in the past 6 months) My mother in-law gets all huffy and puffy and starts all kinds of drama and tells everyone how ungrateful i am because they do so much for us (which they do and i appreciate it greatly) But she misunderstood that i wanted my husband and i to have no one ruin our plans and she thought it was that i was mad about not going to the movies.. The she commented on my other status about me missing my family and was asking why she wasn't family and why i didn't miss her (i don't miss her because i see her every Thursday and sometimes days in between) I was mad at her because she was mad at me. but i didn't wanna be mean to her because i still like her (even though she can be annoying.) So i went in a distasteful path and started to become two-faced. On this path of being two-faced, i send a message to my sister about how she was doing and she asks "do you really think your mother in law is a good person?" (my sister asked this because my mother in-law was cussing and fussing with everyone on my status and fighting with everyone) i said, "no. im two faced to the core right now. i honestly cant stand her sh** right now." My mother in-law continued being upset for awhile so in order for her to stop i had to apologize (also i wanted to apologize because it felt like the right thing to do) so i apologize. Once i apologize things felt a little bit better. I still couldn't shake off the lingering awkwardness that was created between the two of us so i became distant. A week later (which was today...well yesterday since its 1 AM lol) she let me use her laptop. So i logged onto facebook. I was on for a bit then i got off the computer (but not facebook) so that my husband could check his email. When he was done, i never went back to log off of facebook. so the whole night everything was fine. Then around 7 or 8:30 PM (we were staying over for dinner), i find her with her laptop and sniffling and she takes it to her bedroom and i hear her crying. I felt bad but it felt awkward so i went outside. My sister in-law was acting strange and wasn't saying anything to me so that intensified the awkwardness. I come back home and my sister in law is calling me a fat b**ch who sits and eats all day. My mother in-law is telling everyone with whom i have good reputation with about how bad i am. They are telling her if they were her they'd disown me and all kinds of bad stuff. Well my husband and i was confused and we find out my mother in-law was SNOOPING ON MY FACEBOOK! and saw about how i was "two faced to the core and i couldnt stand her sh**" in order for her to see my message she'd have had to have snooped around and click on stuff she shouldn't be clicking on. But i find that disrespectful. Whenever i get on her computer (which is whenever i ask permission first or am offered to use it) her facebook is always up and i dont ever snoop on her facebook ever. i simply log her out and log myself in. My husband was talking to her and she was complaining to him about me. My husband was listening and understanding her and letting her vent but she said "im done talking to you. i dont want to talk to you. bye." And then he just laughed and called her a drama queen. What i dont understand is that she is the one that starts talking to him about her problems. she is now saying shes never gonna help us out ever again. Well she doesn't even have a job and doesn't even try to find one. My father in-law has a job that he works 12 hours for seven days a week and she goes and blows it on cupcakes and concerts. anyway thank you for reading this whole thing. I appreciate any answer and any smart*** answer =)