Hello everyone! I'm new to tarot reading and would love some feedback on what the 3 of Pentacles might signify regarding how my best friend a man feels about me. We've been friends for a while but recently acknowledged some deep feelings and have flirted with each other, but that's about it. While the card's meaning in business is clear, I'm a bit lost when it comes to interpreting it for feelings. I welcome your thoughts! 
Feelings represented by the 3 of Pentacles.
- Windows
I interpret the 3 of Pentacles as signifying the completion of an initial stage, suggesting that there's been successful progress in how your man feels about you. It's a signal to move forward to the next step, indicating a sense of initiation. Additionally, the card may suggest a mentorship dynamic, either with you as the mentor or being mentored. If the other person is younger, they might view you as their patron, and beyond financial aspects, the 3 of Pentacles can symbolize various forms of patronage. In personal relationships, it often reflects a nurturing connection, where one person takes on a mentoring role, creating a positive and fulfilling dynamic. 
- Windows
AbbyDav
The interpretation can vary based on the deck you're using, but it could signify that he's seeing you in a new light and now admires you in a different way. The Three of Pentacles might suggest that he wants to place you on a pedestal because he sees you as a work of art! In a positive sense, of course. 
In the Rider-Waite deck, you'll notice the master craftsman working while others below him admire him. Similarly, your friend might be appreciating the way you work and admiring you for your skills and qualities. 
I suppose "negotiable" wasn't sufficient to convey my thoughts. The emotions associated with flirting and the mutual feelings you both have seem to align more with the Two of Cups. It captures the essence of talking, gazing into each other's eyes, and the stirring emotions within.
On the other hand, the 3 of Pentacles suggests that he envisions elevating things to a higher level. Moving beyond the flirty stage, where you both experience that stirring feeling, and transitioning into a more constructive phase, indicating a desire for a genuine and substantial relationship.
- Windows
I believe he is genuinely enthusiastic and envisions significant potential for a strong, stable relationship. As others have mentioned, he deems it worthy of investing substantial effort—a positive and encouraging card to receive in this context. 
Additionally, I sense a considerable amount of admiration and respect from him towards you.
I appreciate all your responses; they've provided clarity. It now makes sense to me. He seems to admire and look up to the positive qualities I possess. I believe he aspires to be someone deserving of my company. Additionally, there's a strong possibility that he envisions our connection evolving to a more profound and enduring level, aiming for a genuine and lasting relationship. Thank you! 
6 days later
MariiaMelnyk
It seems "negotiable" may not have fully conveyed my thoughts. The emotions tied to flirting align more with the Two of Cups, capturing the essence of talking, gazing into each other's eyes, and stirring emotions.
Contrastingly, the 3 of Pentacles suggests he envisions elevating things to a higher level. Moving beyond the flirty stage, where you both experience stirring emotions, it hints at a desire for a genuine and substantial relationship. The card implies a transition into a more constructive and meaningful phase. 
The 3 of Pentacles suggests successful progress in your relationship, signaling a move forward and possibly indicating a mentorship dynamic. This card often reflects a nurturing connection, creating a positive and fulfilling dynamic in personal relationships.
AbbyDav
I believe this might capture the essence of what the 3 of Pentacles signifies regarding feelings for you. As Anyankah mentions, it's a complex matter, and feelings are often intricately linked with desires. Separating a feeling from a desire can be challenging because the two are closely intertwined. 