Hi there green tea Buddha,
Well kudos to you for gathering the strength to go back and contact your ex husband with an apology. The only problem here is the holding your breath for an apology. The obvious clue here is his viewing your online profile. Now there are two reasons; a. He read your apology and viewed your profile for emotional attachment reasons or b. He was cyber stalking you and looking to play a mental game.
Whatever the reason it was, I’m sure you are aware that in life you may NEVER EVER receive an apology from someone who has hurt you. In most cases when you apologize to someone who has hurt you they will either not respond or give you the silent treatment and pretend it is over, until one day they cyber stalk you or find a reason to contact you (ie birthdays,holidays,etc.) You did the strong thing and all that is left is for you to move forward and let individuals such as ex fall by the wayside.
All the best
Thank you and take care.
-AP85