Of course, your w gets irritated when you don't respond asap. She thinks that you should be sitting by the phone all of the time waiting for her to call and/or text you. She doesn't like it that you may have moved on w/your life. In her mind, she thinks you should be right where she left you.
At this time, are still considering standing and wanting to reconcile w/your wife? Dating is asking for a bit of trouble especially if you are still considering and hoping to reconcile w/your w at some point. What happens if you get involved w/someone and decide that you want to spend more time w/her and then your w wakes up? Adding a third person to the mix...well, someone will get hurt at some point. If you date, then you are giving your w the clear signal that it is okay for her to do it and that you won't have any issue w/her doing it.
Also, you've not had all that much time to work on yourself, grieve and heal from the loss of your marriage/relationship. You don't want to jump into the dating pool until you are feeling better about yourself. All you would be doing is putting a band aid on what is hurting deep within your soul. It is better to work on yourself, find some activities, such as a volley ball/basketball league, bowling, hiking, or take up some of those DYI courses that are offered at Lowes and Home Depot on the weekends.
Check out your local paper for activities that might be of interest to you. Have you completed the list of things that you have put off during the marriage that now can be done? Start making that list of things that you would like to do and get started on them.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.