found another message in bf's phone.

I went through my Bf's old phone (big mistake) and found messages. I also went through his current Reddit account and found a message he sent to another girl saying that if she's ever in town, that dinner and a date is on him. She didn't reply and they don't know each other. The message was sent a month ago but it just hurt me to see that'd he'd do such a thing after I saw a random girl on instagram say to him "I love you". I know she was joking around but she started following him and liking all his pictures.