I'm so confused why she's mad at me?

Okay so my best friend is ally and she's in love with a guy, Jose. So ally had to see her dad a few hours away this weekend. Jose invited me and others to this school club volunteer activity. He said to invite ally but she couldn't make it so basically what ended up happening was it was just me, Jose, another guy, and two other girls. Me and Jose are just friends, neither of us have feelings for each other. During the volunteer activity, we would be in back rooms and stuff and so I kept playfully sexually touching him. Now she's mad at me. But to me, there was no feelings involved, they're just bodies. And I thought she thought that way but she told me she was upset because I didn't understand her and consider her feelings. But I did consider them. I thought we thought the same because she's done casual sexual stuff with guys in the past and had no feelings for them. So I thought she'd be okay with it. And they're also not together. She loves him but he's interested in another girl so it's not like he cheated with me or something. Why is she mad? Also she said this is why she doesn't open up to people and she doesn't trust me anymore how do I get her to trust me?