I'm seeing my ex bf soon at a family reunion cause I'm bffs w/ his cousin what do I do?

I still like him A LOT! And he always tells that cousin that he misses me and stuff.... But how do I introduce myself to him again... without it being awkward. My name is Meg by the way! I just need a way so it won't be awkward and I can hang out with him and get to know him better since we broke up a few months ago! Please help. Thankkk youuu!! :)