(((Belle)))
Why don't you replace your negative thoughts with the good ones?
Try to build up an imagination, positive image about yourself and your future rather than thinking about the past and Mark.....
I'm so happy that you are not with Mark....He was not right for you....He didn't know what he wants and he would not make you happy....I bet you he will not be happy in any relationships.....
This guy, I forgot his name, sounds like a very good guy....just enjoy your relationship and don't spoil it with those negative chatters in your mind....each time those negative thoughts came into your mind force them to get out....then it will get like a practice and it will happen automatically....
There are millions of people out there living happily in a long term relationships.....and you will be one of them

hopefully me too
okay, it's 1am here and I'm still up....It's better I go and sleep, otherwise I won't wake up in the morning....
xoxoxo