Being misunderstood

How do you deal with being misunderstood?

Well something happened to me recently and it got me really upset at the entire situation. The most painful part of it was that I was misunderstood by someone I didn't expect it from and the whole attitude I got was super uncalled for and really low if you ask me.
So it was the birthday of both my uncles, my aunt's husband and my cousin's husband and I'm really close to them both. I was in my aunt's house that period for a bit and I happened to be present for that celebration. So I wished my uncle a happy birthday that morning and he asked me to pray for him cause he needed prayer most and so I prayed and we talked a little before I went to sit at my aunt's shop in front of the house. So that morning also I called my cousin's husband to also wish him a happy birthday and we talked for a bit before he told me he would call me once he closes from work so we could go out, I thought he was joking so I just said okay and the call ended. Later that evening my aunt and her husband were going out, my aunt wanted to take him out to take Arabian tea and fish to celebrate him, so they passed by the shop to tell me and we all laughed a bit because they were to take a bike and my uncle said it was more romantic than taking the car.
Few minutes after they left my cousin called me that she tried calling my aunt but she wasn't picking, I told her she just left with her husband, they were going out. That was when she told me that it was her husband that asked her to call me and my aunt so we could go out for his birthday together, I sha told to give me few minutes to call my aunty and ask for permission if I could go since she wasn't around, so I called her and she permitted me.

There's this other cousin of mine who's around the same age as I am, but she wasn't invited, so I told her I was going to my cousin's house cause the husband sent for me to celebrate his birthday. Funny thing is she was there when all those calls were going on. So I went inside dressed and left. On getting to the house I met my aunty and her husband there, I was surprised myself cause they were supposed to be on their own outing.

She Sha told me that she and the husband didn't get what they wanted where they went to so they just decided to tag along since it was the same kind of outing. We all Sha went out together and we had a really good time cause mehnn I ate good😂.

I took some pictures of the outing and posted it on my status, unknown to me this was about to cause serious misunderstanding between myself and my cousin who wasn't invited.
we got home and I was welcomed with cold shoulders and even before I got home seff she viewed my status and sent me some very funny comments like I think she's a child, I planned an outing with my uncle and aunty without involving her, blablabla... Omo the talk was plenty. I even tried to explain the whole coincidence that happened and how it was so unplanned but she didn't have it, she even called me a liar and this was where I lost it myself and I saw no need explaining my self when you've already made up your mind on what to believe. Omo naso me and this babe stop dey talk oo, we sleep and wake up in the same room but we don't talk to ourselves, this went on for almost a week, we're good now but it wasn't a nice period for me tho. But how do you deal with being misunderstood?