My boyfriends ex contacted him after like 5 years... should I be worried?

beachygrl83
My boyfriend and I have been together for a year and a half. We live together and everything. Out of the blue this chick (who has a boyfriend and also has a house with this guy) contacts my boyfriend. He did tell me about it and she also wanted to meet up for drinks with him. Should I be worried? It started out where the phone rang and he seemed puzzled letting me know it was an ex. He also mentioned that he got a text from her earlier. A few minutes later, the two texted each other back and forth. Not a whole lot, because by the 3rd time I got really peed off and went to get ready for bed. He only dated her for 10 months, did exchange the I love you, and broke up due to the relationship feeling like a friendship. I think its weird that out of no where she's reaching out to him now. Like I am sure they have exchanged words in the past cause they are friends on Facebook. Should I be worried. I mean he did tell me about and he told me he isn't going to see her. Could she just be really being nice by saying hi?
My boyfriends ex contacted him after like 5 years... should I be worried?
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