So earlier I posted about my boyfriend and his ex and now I’m really confused

I need help! I don’t know how to react to this I’m so in love. Don’t want to come off as insecure but she messaged him on Facebook and said “you in a relationship but you love me wow. I’m boiling hot right now trying to hold my composure like I’m not mad about it. Is she picking with me or is it a possibility he’s talking to her.