Porter's 5 forces

Porter's 5 forces play an important rule in our life,our actions to an extent are governed by these forces acting on us and the given situation.
As an example let me talk about Porter's 5 forces and their application when you like someone.
Rivalry:
Look at present Bf(if any), Ex BFs(Their relationship duration,time since break up,how close are they) this affects the "detachment" levels they have with their ex.
Also check out potential/present competitors. Try and do a SWOT for them and attack their weaknesses,exploit their threats.

Buyers Power:
Your Distinctive competitive advantage could be anything, ranging from your intelligence,personal traits or even your wallet size in some cases!

Supplier Power:
Find her weak spots this lowers her barriers towards accepting you.

Threat of New entrants:
If the girl is talkative,overtly friendly such signals maybe interpreted by others as low entry barriers.Be careful while entering such markets.

Threat of substitute products:
Presence of girls in same locus of acquaintance. Even a simple smile to another girl may set the time bomb ticking. Think about entering other markets only if no possible value creation in present one.