Here comes half a lumber yard full of 2x4's. Don't read this post if you don't want any 2x4's now.
First, just read your post. The word "I" appears most often. Thus, one may reasonably conclude, as your BH may have, that in your head this is all about you. Read around here. Its supposed to be all about him, not you.
Second, you made a scene about your wedding ring. See first comment. A wedding ring is hardly the biggest issue you two are facing. Think about it. What is he telling you by reclaiming that symbol of love and fidelity? He doesn't think you deserve it now. Think he has reason to feel that way? If so, tell him you understand, and apologize for your fit. If you trusted him.....well he trusted you and got burned. Why do you think he pulled this on you...he wants some pain inflicted on you for breach of trust.
Third, what do his plans to leave Europe early tell you? Maybe you love being there, but for some reason he's perfectly willing to leave alone and leave you there. OM in Europe? Too much triggering for him in Europe? Perhaps from dashed hopes for R in Europe? You don't tell us what you think or even if you want to return with him. You recognize you're being tested, but the answer should be obvious if you have genuine remorse for your A. Or maybe he's made up his mind that D is in the future and is returning home to start that process. I don't know, of course, but there are many signs here that he is separating from you.
When did A occur and where? What was D Day? Were you caught or did you confess? Did you TT him at any time?
Finally, you admit to feeling sorry for yourself. Think he doesn't feel sorrier for himself? He trusted you and was repaid by an A. In his mind at least you had some fun, and you certainly had the choice to A or not. Whether you understand and can articulate the "why" or not. He had no fun, just pain, and had no choice in the matter.