I'm looking for a manga in which the main character is object of strong affection of another, but he\she is unsure what to think about it. It might be unconditional love, trying to fit a role in a forced relationship (for instance wife\husband in an arranged marriage) or self chosen slavery. In other words main character is cared for\loved for no real reason and finds it troublesome. Preferably the troublesomeness should come from sorting ones feelings for the other party rather than the actions of the other party ("How should I respond to that?" sort of thing).

Main character can be either male or female, but the other character has to be of opposite sex.

Please no: hentai, shoujo-ai. shounen-ai, smut

Examples (including partial):
Dears - we had that to some extent in there I guess; the guy definitely had trouble sorting out his feelings
Re:Marina - a woman pops out out of nowhere and shows plenty of affection to this teenage dude, but he doesn't know her, doesn't know what to think about her and finds her advances troublesome
Otoyomegatari - doesn't really occur in here, because both of the main characters try their best to fit their roles, but if only one of them acted that way, then it would fit
Koharu no hibi - mostly fits, though the guy was kind of attracted to the girl from the start

Hm the first thing that came to my mind was Hayate no Gotoku!. But on a second thought it doesn't really seem to fit.

Hitorimi Haduki-san to. maybe? She definitely thinks it's troublesome xd

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First thing that popped into my head was Bright World Project, but you're already reading it. Yandere++

Perhaps Ore no Kanojo to Osananajimi ga Shuraba Sugiru
Yesterday wo Utatte