Hi Purple, glad you've started another thread. It's really hard isn't it when they're convinced you're just out to cause trouble.
I actually think some of the words you've used in your post might make a good basis for a reply? The bit about the last thing you want is to cause him stress and pressure, just want him to be happy , healthy and loved - that comes across straight from the heart...and might be enough in itself for now, see what comes up in the meeting tomorrow.
I still think trying to connect non-judgementally with him until you feel he is ready to open up around his feelings in all of this, will be key in helping to turn things around. The end goal really is to gain enough "safe" connection to be able to
communicate to him (and him be open to hearing) that you understand his situation and still care about him (this is what I'd hoped a yp professional would be able to work towards with him, easier to achieve from the outside sometimes because not emotionally involved, but not impossible)...that it must have been difficult to feel like he had to choose between his relationship with his gf, and his relationship with you. Once he can begin to look at his feelings about it a bit deeper, the push and pull between you both will become evident to him and you'll have something more to work with. But he will only be able to achieve that when he feels secure enough in your connection, which still sounds delicate.
So I agree with others, continue just killing with love and understanding, to nurture and progress the connection, keep going back to basics whenever it feels its getting off course. Tell him things like you hear that he's worried, you're sorry if taking the steps you have has made him feel you're trying to cause trouble, you want to reassure him you're really not, that he's nothing to be worried about if the relationship is positive and good, it'll all come out in the wash etc. You hope he'll understand and forgive your concerns one day. You were sorry you didn't get much time to talk before, don't want to upset him at all, just want him to have healthy relationships both with gf and with you and would love to see him again properly.... any or all of these types of things might be helpful I hope, I'm sure others will have different ideas too. Again go with what feels most natural to you x