I can't help texting my ex-boyfriend. Is it cheap?

Not really. You can still be friends after breaking up, but it is better to send as little as possible. After all, you also said that you have a family. I did send it to my ex-boyfriend, but I don't have a boyfriend now. He sent me a blessing message during the Chinese New Year, and I was very happy. He also said thank you when we first met, so did I, but I don't know when my yearning for him will end, and maybe it will never end. I am in the painful stage of lovelorn.