Are you still pondering about ex's intention? Are you still hopeful that there might be some special place for you in your ex's life? Thinking positive about the relation can always give result at the end.
If not bringing him/her back but at least solace to your empty soul.
Then why not go and check with some definitely signs.
Change of expression: If your ex's expression changes after meeting you then it is the positive sign that your ex is still interested in you.
If he/she finds you with someone else of opposite sex and making certain postures as if he/she is not comfortable at that situation.
Then never give it a second thought that your ex is definitely not over it.
Frequent calls: If your ex is still taking interest to know about what you're doing these days.
If he/she is also keeping you updated about what he/she is doing nowadays just to check your eagerness about him/her.
If he/she is dialing your number just without any reason and staying with you for a long time over the phone asking you about your own things.
If he/she is still addressing you with terms like sweetie pie, honey, sweet heart.
If he/she is still waiting for you to hang up the receiver first - then these are definitely very positive signs that your ex is still interested in you.
Common friend linkups: If he/she is interested to know about you through any common friend.
If he/she is asking about you very frequently; if he/she is taking your updates from that common source - then you can say you're still alive in his/her heart and he/she is still eager to revive this relationship.
Not moving on: If your ex has not yet started dating someone else; if he is still not moving on with his/her life - then what else is more convincing that he/she is still waiting for you.