My gf of 1 year and 3 months' sister said the other day in front of us "did you tell lionheart about (insert her ex's name here)." My GF said "no, its not even a big deal." So when we are alone she brings it up and says:

"My ex has been trying to make friends with my cousins, and to hang out with some of my distant friends. Obviously to get attention from me. He texts me and I ignore him or just nicely reply (I can confirm this I checked her phone), not as much recently. But back on mothers day he did send my mom flowers obviously to get my attention, and I didn't bite. He is kind of a pussy. I didn't want to tell you because I didn't want you to think it was anything."

I told her it is kind of sad, she can't do much about him making friends but if he continues to text her then tell me and I will be texting him one text message that will get him away for good. I told her this is something I am going to do. She agreed and said she would tell me.

Is there anything else I can say/do?

Handled it pretty well, just be cool and unaffected by it. She sounds like a keeper.

Yeah, you're doing well. Get her to download a text block app and just block him. We live in a world where if you want to ignore someone you can. If he persists in person then it's another story.