Welcome! Many of us are in a similar boat. 

I find that life seems to move in a circle, always ending up back where I started eventually.

The reality is that it's really like a spiral, we go through similar situations but we are on a different level. Kind of like working out, pushing the limits always feels the same, but as you grow stronger, you are actually lifting more weight. It looks the same and feels the same, but it's not.
   
Have you ever checked out the "Stages of Change"? You can read all about it here. guardyoureyes.com/forum/54-SMART-Recovery/346927-How-The-Stages-of-Change-can-help-you#347006

My name is SG, I'm a recovering GYE posterholic... Just kidding, (I'm not really recovered) I've been on gye for about 6 years, a large part of which I was a binge poster. Oh and p*rnography, and masterbation, and an awful lot of fantasy. On Gye I learnt a lot, I heard for the first time that lust was not my problem but was rather the solution to my problems. I didn't really know what that meant since I didn't really have any problems (other then motzei zera lvatala). I spoke with Gye members on the phone regularly and eventually met several people. We read the 12 steps of Alcoholics Anonymous and tried to apply them. I learnt a lot. The only downside for me was that I was not staying clean.  I fell so many times that I started making up random things to write in my 90 day log each time I reset. How many times can I write that I just gave in - again. Eventually I got sick and tired of the continuous cycle of counting and falling that I but the bullet and joined Sexaholic Anonymous. In that setting I began to stay clean longer and many aspects of my life and marriage have improved since then as I began to work on my life in order to stop my need to act out. 
getting back to the above post, one of the central ideas of SA is the concept that for people like me who had really really wanted to stop and really tried to stop and still were not able to stop (for years) are actually powerless and cannot stop on their own.  Only a Higher Power (who I call Hashem)s is actually able to stop me from acting out. Some days I really tried all the tricks that I could think of, and still I feel that I'm going to fall, so I turn to Hashem and say "Totty, there is no way that on my own I won't act out. I've always fallen in this situation in the past. I really can't do it. But You can. Please take away my lust for this person or this situation because when I lust it drives me far from you and ruins the good life that You gave me." Somehow, when I do this it works. Sometimes it's truly too much for us, we can turn to Hashem and He'll carry us.

Hope the new perspective was better than the old one. :-)
Sg

I don't agree with the implied assumption that only addicts need SA. I don't know if I am an addict or not. I certainly had some addictive behaviors. I know that I benefited a lot from doing the 12 Steps. It seems to me that someone with strongly ingrained bad habits could also benefit from the 12 Steps and or SA.

I got a lot from Steps 1-3 in finally realizing that I had to truly depend on Hashem to help me recover. Step 4 helped me understand and face the many issues that were causing me to feel anger and frustration. Step 9 was important in getting closure with many problematic relationships.