littlecritter if he still regrets what he has done in 6 months and nothing further in the way of lies or deception has come to light then perhaps you would reconsider having him back
I dont recall all the ins an outs of your situation as your thread vanished but isnt it the case he has been seeing ow and you needed an std test ?
It took me a while to realise how my self respect and self worth had gone awol during the last years of my marriage and if my exh had made noises about coming back in the early days I would have leapt at the chance. Fortunatly for me there was never any talk of it (although he did keep his options open in the first weeks after moving out by claiming to think about his future)and so I am now well on my way to a better life without him.
Littlecritter it sounds to me like his regrets are based around his own comfort and well being and if I were you I would need an awful lot more to go on . Why did he leave did you ask him to go when you found about infiedelity ?
My few weeks on MN have shown me how many of us women put up with being treated in all sorts of negative ways in the name of love, because of children, fear of a future without security of a partnership and always in the hope that things will improve if we just hang in there.
My few weeks on MN have also shown me that those that be strong enough to get over initial few weeks of horror ALWAYS begin on a journey of seeing that the split is for the greater good and in the long term they will be happier however uneven the process of recovery may be.
It sounds like you have plenty of support so keep him at arms length for the time being at least.