X Factor 😑

My ex wrote me on Facebook today. We keep in touch on and off since we broke up 2 years ago. He said he missed me and asked to see me... then said sum things with sexual references. He is in a relationship and had been since Valentines Day 2 years ago. He seems happy on social media. Would I be wrong to tell his gf he is saying out of line things to me and asking to meet up or should I just cut contact and mind my business?