Relationships

I have a girlfriend that keeps spending the night at her ex's house and she doesn't even ask me anymore, and I dont know what to do... any ideas?

So me and her have been off and on over the summer and it wasn't even a week after me and her ended up breaking up because she said "your always too busy" when I tried my best every single day to spend time with her... anyways she got this new boyfriend like i said less than a week afterwards and now that school started back up she came back and me trying to be nice took her back cause her summer boyfriend used her. Anyways now every single weekend she goes and spends the night at his house Saturday and Sunday and she used to ask me and I didn't care cause he had siblings and they were her friends so I didn't care. But now she dont even ask and she just goes to see him and always acts like she is busy and tells me to calm the siblings down on snap when she is in the same house as them... I just dont know what I should do... I love her and trust her but at the same time its trusting away that trust every single day... and this isn't the first time she has done this either but she used to always ask, and it was with a guy bestfriend of mine that could take her fishing when I couldn't. So I didn't really mind... but now it's just tearing that trust apart and ruining my mental health... I don't know if anyone cares about that but still... being depressed in a relationship just doesn't feel right... the really bad thing is... she has every single class with me in school and she never seems to want to see me unless we can have sex or makeout all day... I've told her it makes me uncomfortable and I've never even dreamt of doing that to her and she just chews my ass because "I dont trust her" what should I do?

I have a girlfriend that keeps spending the night at her ex's house and she doesn't even ask me anymore, and I dont know what to do... any ideas?
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