Too soon to date again?

We broke up about five months ago. It has been so difficult, but I am now getting to the other side of it. I recently went back on a dating site out of curiosity, and I don't know, a part of me just wanted to see if it was possible again. But then I've matched with someone. I feel really conflicted.

A part of me is curious to see where it goes. But then another part of me is still healing. I do sometimes think about my ex, and if I post on Instagram, I wonder if she sees it. Not for her to reply, but just that I might still matter a little bit. She deleted photos of us together about a week ago from Instagram. I know deep down she is not coming back... but I don't want to betray what we had either.

She ended it; she lost feelings for me for a while. But she means so much to me, and always will, probably. When do you know when to move on...?