How did Dudley get engaged? Is he Ukrainian too? Hook up on a vacation? Arranged marriage? How long have they been engaged? Lot of questions but it sounds a little strange.
Well, it's certainly not platonic, from what you say.
What's your relationship besides sex?
You're sharing an apartment I guess, did you move in with him, or he move in with you?
Are either or both of you working?
Share the rent, utilities, groceries?
If your arrangment is mutually beneficial, in more ways than readily available sex, he may be looking at it as just a good deal. With that arrangement I'm pretty sure I'd love you and say so. That doesn't mean, however, that I'd be in love with you. Do you know what I mean by that?
Attachments are always complicated, affected by circumstances, all of them. Need to know as much as you can reveal comfortably, but be warned, you may not get the answers you want to hear.