My gf was in a 5 year relationship with her ex. She had told me that their relationship went sour, but that she still enjoyed having him as a friend. I have confronted her more than once about how it makes me uncomfortable, and she always tries to reassure me that there’s nothing to worry about. She also tells me that she always makes sure to remind her ex that them hanging out is nothing more than platonic. Occasionally, they will take weekend trips (she does this with her girl friends too), but it makes me really uneasy. I couldn’t see myself doing that with any of my exes.

What are your guys’ opinion/advice on this?