[TLDR] Girlfriend went camping with her ex whom her parents invited and she posted a video of them laying next to each other while complimenting his ass. She says it's not a big deal and that they weren't doing anything but idk if i believe her.

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a little bit of a backstory, My girlfriend was with this guy for around a year and within that year he cheated on her around 10 times (she had a list of names) and she forgave him every time for some reason I will never understand.

My girlfriend and her parents went camping with her ex-boyfriend only because her parents invited him because they used to be close. They broke up about 3 months ago so it wasn't unreasonable to believe that because she hadn't told her parents that they weren't together anymore. She told me that she didn't really want him to go and that it was going to be awkward and not to worry about it. Later on in the day I look at her story and there was a video of them laying right next to each other she was recording his butt and it had the caption "his fatty" which pissed me off and I confronted her about it. She told me that she was only next to him for the video and they weren't close to each other and were watching a movie. I asked her how she would feel if I recorded a video of me with my ex and said she hat a fat ass, to which she said it wasn't like that and that she was just messing around with him because they were friends. She keeps trying to tell me it's not a big deal and that they weren't doing anything but I don't feel like I can trust her. So is it really not that big of a deal?