Boundaries?

JoMama
So my there's this girl my husband grew up with-their families were always doing things together and were close.  I saw her in lots of pictures so I asked him about her and he just said she was just a friend, never had any feelings for her.  A few months later his mom was talking to me and randomly it came up how he had such a crush on foreverrrr, although it was a bit unrequited. A little time goes by and I'm cleaning up some old files on our hard drive his mom gave to use with old pictures/files.  I opened one and it was a paper he wrote about this girl in college...confessing his undying love. I asked him about it and he kind of brushed it off. So weird.
Today she posted on Facebook that her father had committed suicide. Super sad and my husband and our family is very visibily upset. I knew I needed to keep my jealousy in check especially now because it's important he reaches out.
I read the texts him and this girl sent tonight and he had told her that anything she needed he was here and finished it with xoxo. 
Does anyone else feel like xoxo is a boundary crossed? It just hit me wrong and I'm feeling pretty icky about it.