Should I be mad/upset/uncomfortable that my husband still hangs out with an ex fu*kbuddy?

So whenever my husband visits his hometown he gets together with a group of friends (mostly male). But within that group there's a girl he was on and off with and USED TO have sex with every time he visited home.

They hang around, smoke blunts and chill. Makes me feel uneasy but I don't want him to cut out people he's used to having around. He said he feels nothing for her anymore on his part.. not sure about her.

Should I be mad/upset/uncomfortable that my husband still hangs out with an ex fu*kbuddy?
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