boyfriend texting female friend

Samantha • Leila Jade's mommy 👶🏼💘
My man and I have been together for 4 years and he's always had this friend that's a female that he dated in high school for a short period, he said they are just friends but I saw her texting him tonight and he said he asked her to hangout soon. Last time he saw her was right before I got pregnant and we were on "break" and he had sex with some girl at her house.... so I really don't trust her or him talking to her.  Am I being paranoid ? Would you let them hangout? He swares it's nothung