How can I casually ask my ex to hang out with me/tell him I miss him?

Anonymous
It's been about a month and half since my ex boyfriend broke up with me, and I have been very minimally in contact with him since (a few emails since I'm abroad and wanted to get him a souvenir, wasn't sure what he wanted). I'll be back home in a few days, and I want to casually ask him to hang out with me and also to tell him I miss him. Part of the problem of why we broke up was that I got clingy (but it wasn't really that bad), so I don't want to come on too strong.
How can I casually ask my ex to hang out with me/tell him I miss him?
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