My boyfriend left a message to his ex-wife: During this time, I always think of the days with you and the happy times we had. I left a message for my ex-wife: past.

The first message is obvious, that is to say, they had a good life, were happy and kept secret. It means that they are not as happy with you as he and his ex-wife were. In the second paragraph, this is a confession. I think he might want to get back together with his ex-wife At least he has this idea, so you should be careful. What I have is for reference only. See for yourself.