i see High Priestess as inner knowledge and lovers as choices and a romantic connection...so secretly crushing on someone else and cheating? Like 7/Swords--betrayal and cheating?
Cheating? No, I can't see that in this.
So, you have High Priestess, The Lovers, & 7 of Swords.
Sounds like someone is standing back and observing before making a move. I can agree with what others have mentioned:
a secret admirer, a crush, admiring from afar, someone who is unattainable.
The thing is, I don't see cheating in this. If The Lovers is intuited by you as a "choice" then I can definitely seeing it as someone who is trying to decide whether to let someone know their true intentions (High Priestess). High Priestess is knowing things either a lot of people don't know about or self-knowledge (to me). I see it as, this person knows how they feel, but whether or not to act on it (tell someone), is the true question.
If you throw the 7 of Swords in the mix with the picture it has (I'm looking at RW), then I see it as someone who is carefully assessing what they can get away with saying (or not saying) or judging the situation from afar to figure-out costs & benefits. They show someone "stealing" some swords, but, in a combination that you mentioned above, I can also see it as gathering information without someone else knowing (that's sorta stealing, right? lol).
Don't see cheating, though. For me, I'd need some Courts (but, that could just be how my cards & I interact, sooooo, lololol).
So, maybe, the person can see the person as unapproachable, even though they may like them, & they're simply trying to do research on how to approach them about it?
EDIT:
I'm editing this to say, now, I have no clue what situation the querent is in, soooooooooo,... If the HP + Lovers sat together in a reading with
someone involved, yes, I could see cheating (in that context). If the person is single, okay, I can see a crush. The Lovers always (for me) has shown someone in already in some type of relationship, but, it doesn't do this for everyone, lol. But, since I automatically took away that the person was single, I didn't see cheating in the mix. My fault.