UPDATE: His sister called me yesterday because he went out of town and she was watching his dog, and the dog got loose and ran away. Luckily the pound called and she went to pick up the dog but needed the dog's vaccine record (which I have). After we straightened everything with the dog, she called me again to invite me to a Holiday party with her and her friends. Her other brother and sister-in-law were going to be there too. I hesitated at first and told her that I dont think I could, but she insisted. Thats when I told her -- "I'm going to be honest with you, it's been three months since your brother and I broke up but I still love him very much and miss him every day. I've kept myself busy and tried to move on but Im having a hard time. I really loved our relationship and you and your family too, so seeing you all will be hard for me."
She told me that she knows her brother very well and that he doesnt usually last long in relationships and that we lasted for a long time. She said that the family was surprised that we were always together because he never brought anyone around that much. She said that when he gets overwhelmed, he could easily withdraw from EVERYONE, that he's stubborn. She said that the family hasnt seen him much lately because he's always busy working and that he hasn't even put up the Christmas lights yet (which he does every year).
She encouraged me to text him from time to time and that I should hang out with her and the family so he can hear my name and get use to me and hopefully he will slowly open up again. She said that there was still some business to do with the dog's registration and she was leaving (today) so she would tell my ex that I have the info and that I will help him finish the process, that I should text him on Monday about the dog. She asked if he's texted me, I told her last week he asked for a recipe. She said thats a good sign and that I should keep texting him (like most of you have said, thank you). Now that I am getting encouragement from his sister, I feel more confident about texting him
So, I ended up going to the party, she is friends with my cousin's wife, who was also there -- having my family there helped me feel more comfortable. It was nice seeing my ex's family and nieces and nephews, they all hugged me and were happy to see me. It was nice knowing that his family likes me a lot and I ended up having a fun time at the party
We'll see what happens!