Should I contact a friend of my ex (female friend)?

TacosRAwesome
A few months ago I ended a 4 year relationship with someone on not so bad but still not so good terms. During this relationship we made friends with a few cop people, but since I was not exactly allowed to work, he was always the one setting up meetings and I simply join him. Now one of these friends was pretty cool and I want to hang out with her. Is it ok to contact her or she's his friend now and I'd be entering enemy territory?
Should I contact a friend of my ex (female friend)?
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