I want my ex-boyfriend to see your circle of friends, remind me of you and even regret leaving you.
First, don't send any information about the past, let him know that you have put the past behind you and don't care anymore.
Second, fuck your colleagues and friends. Of course, you must have colleagues and friends of the opposite sex, which will make people feel that you have a full life.
Third, bask in your study and career. For example, you are learning new skills or reading a famous book. It means that you are not who you used to be, but now you are growing.
Fourth, bask in the lively scene of eating with friends.
Fifth, bask in the fitness scene. It means that you are insisting on exercise and fitness.
All this means that you are making progress, improving and becoming a better self both inside and outside. Such a girl, who can not be tempted?
And when you really start to love yourself, you really won't remember and dwell on the past, but you will look forward and meet him better, and you deserve him more.