Not really, but yes in some ways... It might hurt your feelings if they're talking or telling about his new girlfriend....
So basically... yes
ANSWER:
No it's not, as long as you bring another friend with you, it will be fine. Or you can take your boyfriend to meet your ex so that way he wouldn't think that you still want him be part of your life. Just be careful and don't let your old feelings run away from you..
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