Ex broke up with me two years ago. We enjoyed the same hobby and have many friends we did it with, including mutual friend. I took up cycling instead after our breakup so hadn't seen this friend too much. I bumped into him last week and asked me if I'd like to go for dinner with him sometime. I was really shocked as never thought of him in this way. I've asked him to give me time to think about, but my gut is saying no because of mutual friendship, I was very hurt and am not sure I want to get involved with someone else so soon as I'm really only getting back to myself with the help of counselling after a five-year relationship.
How long should I take to reply to him and would it be okay to say I don't feel ready(even after 2 years) but I'm not saying no, but not right now?