Yet, it is definitely a sure sign that shouldn't be overlooked.
He is clearly thinking about going down that route with her again.
This red flag is completely the opposite of what has already been listed.
There is no excuse why flashbacks of his ex should be racing through his mind.
That period in his life has come and gone and should be replaced with building new memorable moments with you.
Getting into a new relationship with a new guy is full of uncertainty – especially if he is still in love with his ex.
However, this situation can happen to anyone, in any type of relationship, no matter how many anniversaries celebrated.
From personal experience, it can be hard for a person to heal from a past love that had such a profound impact on their life and heart.
Therefore, there's no point in driving yourself crazy about the issue, but to recognize it and act accordingly.
Furthermore, he openly criticizes the new guy in some way.