I would take a big detached step back and ask some vital questions before you allow your heart to hope.
1) Was this out of the blue or has he still been in contact this entire time?
If you never had a strong NC implemented when he left he has kept you on the hook as his safety net plan B all this time and now signs of life with AP is not that great he is reeling you in.
If you did have strong NC and this is out of the blue it leads me to...
2) What has changed in his life to come back? (unfortunately 'we're married' is not the option here since it wasn't important enough for him to remain loyal)
If you can are you able to employ your investigative skills. Has AP moved on to someone else? (if yes, you're plan B and he is unsafe to take back) Are they fighting? (if yes, he is running away from the new relationship and has nothing to do with wanting you back) How is his job? (I've read it before AP is on welfare, wayward gets fired and he loses his comfy house life so he comes knocking on BS door looking for the cozy life until the WS can get on their feet again.) Is he injured himself and needs your insurance? Has he had more than one woman now and none of them have met his caretaker needs and "you'll do"? Is he bed hoping or has he been single? (if he has been single this is a better sign as he doesn't want anyone else and he could be genuine he wants to try to R.)
I would also ask the motivation if he is in a rush to R, again why now? what's changed?? Is he willing to take this slow? If not why not and if yes do you trust him not to sleep around while he is under a different roof?
3) Has he done the work? Actions, not words.
Not "I will go to IC" but rather "I go to this [xxxdetailsxxx] IC and I am improving, I want you to meet them".
Not "I am leaving AP" but rather "I live by myself at this address [xxxdetailsxxx]" Also has he been single or is he bed hoping yet again?
Read this on the wayward forum "Admitting it vs. Getting it vs. Owning it vs. Living it":
https://www.survivinginfidelity.com/topics/615240/admitting-it-vs--getting-it-vs--owning-it-vs--living-it/
Would he even tick the first one?
Is he willing to give you a timeline and go with you to get a poly (to test the truth of the timeline) before R is on the table? Is he willing to truthfully talk about his whys without shift blaming?
4) Are you ready to go through this again?
We had months of back and forth and then he finally ended it & pretty much started seeing her again.
Because without the work and without empathy and without remorse it's likely he will flip-flop again. Are you willing to risk it? is R with him worth going through that but this time without your support network since you mentioned friends and family will likely not be there this time round.
5) Would he be willing to read some books on infidelity and how to help the BS heal from their infidelity and talk this over with you before you "get back together"?
There are other questions of course but you know what it feels to believe him and hope "this time it'll work" only for him to run off and leave you again so before you let your heart rule, let your logic rule. This isn't the first time he has wanted you back after running off, are you willing to go through it again?
There are a lot of great articles in the healing library, sisoon pasted a few and "Before You Say Reconcile... Recover" is one to read over a few times, another I'd add one to the mix:
"Reconciliation the Wrong Way and Reconciliation the Right Way"
https://www.survivinginfidelity.com/healing_library/reconciliation/right_wrong.asp
You haven't said much about if you've been in contact prior to this revelation he wants back but no where do I see examples of true remorse or examples he is working on being a safe husband moving forward. Just because it's not as fun with AP as he thought isn't an excuse to R, he made that choice and committed to her when he left you, just because that's broken down for him doesn't mean he is "fixed", those issues will forever remain until he does the hard work.
IDK I always question motives in waywards now, unless honest remorse and empathy and work is shown, all actions, I'm cynical and just think you're setting yourself up for the painful reality of false R. You know he is a lair, his words can not be trusted unless they're backed up with positive actions.
[This message edited by LostInHisFog at 6:24 AM, July 10th (Saturday)]