Right or wrong?

My boyfriend has this girl he’s been friends with since like 2009-08. He’s 19 years older than me, I’m 23 & he’s 42 & we just had our little girl almost 3 months ago. His friend is 40 & they text literally all the time. Well in the beginning she tried her hardest to make me jealous on social media with him by posting hearts on his page all the time & making unnecessary comments. He told her to stop that it wasn’t okay to do that, well now she’s recently started doing the same thing again & I told my boyfriend I’m not okay with his friend disrespecting me like that on social media, it doesn’t look right. I don’t like her for that reason, it’s honestly very petty of her in my opinion. I feel like she’s starting to become a problem & I’m not trying to ruin their friendship but I feel like if she’s trying to come between us there should be a cut off line if he really cared about our relationship. I’ve never met this girl before so I don’t understand what her problem is. Am I right it wrong for feeling this way?