Benefits were not mentioned.  I happened to see this in a forum.  You've got long term, serious thinking on your mind and don't want to settle for a lot less.  (I will say sometimes us older, second or third...or fourth relationship folks can handle some variation of the typical boy-girl love affair as long as both of you are comfortable.  It may not stay that way, but try)  I'd say recheck the temperature in some way at least once or twice, after you gave him or her some time to be apart. At the same time take stock of the possibilities and get ready to move forward to your goals. 

SURVIVE A BREAKUP
Did she say "Let's just be friends", "I am not in love with you", "I still care about you" etc.?
Then:
1. It's over - as in FINAL. She's gone. She's NOT coming back.
2. Her FOCUS in life is someone else already. You're nobody.
3. You're no longer welcome. DO NOT MAKE CONTACT. Do not call, do not write - EVER. You're annoying her.
Dumpees, Wake Up:
SHE'S ALREADY MOVED ON. SHE'S HAPPY. LEAVE HER ALONE. DON'T BOTHER HER.
4. You MUST break the attachment by focusing on YOURSELF.
5. Don't even THINK about being "friends" with her. Don't torture yourself.
6. Get her OUT of your life. Get her pictures, letters, and other reminders OUT OF SIGHT. Pack them away or trash them.
7. Acknowledge your grief - wail out loud, punch your pillow, let your heart mourn. Let the pain out.
8. Express your anger. Write a farewell letter to her, but DO NOT SEND. Write out why you were or are angry at her. Get them all down. And why you are angry at yourself for what you did not do
9. Exercise A LOT.
10. GET OUT of the house. Go do things YOU like to do.
11. Stay away from alcohol.
12. Determine the qualities she had that you want in future partners, and the qualities she had that you don't want.
13. List the lessons learned - What you should have done differently.
14. It is tempting to hold on and scary to LET GO. Say to yourself that you're letting go of her. LET THE PAST GO.
15. Structure your time and stay BUSY.
16. INTERRUPT yourself whenever you get stuck thinking about her and REDIRECT your focus onto something productive.
17. Take it ONE day at a time.
18. It's better it happened NOW rather than later down the road.
19. It's GOOD that it happened, because you're now FREE to find someone BETTER.
20. A NEW and BETTER life is waiting for you. You WILL find someone BETTER. So MOVE ON!!! - BECAUSE SHE ALREADY HAS.

I must be getting old or I've got a big soft spot somewhere.  If I had ever heard the "lets go slow" or the "let take our time" line in the past, it was clear it was time to move on.  Just women talk for letting a guy know she didn't want to get serious in either of our lifetimes.  It probably still means that in most of the situations, but I did ask myself that are there some possible nuances here that I need to understand better.   In the process of that thinking, I ran across this five page discussion, that gives you the female and male perspective on an interesting situation:  more than a few dates, sex once, apparent outward interest on both sides, etc.  Lots of ideas and thoughts so worth reading, I say and linking to.

What does it mean when a women tells you she wants to go slow

Does it mean anything different if a man says it?