Leo personality will 'drama' the situation and
even if I seemed to be affected - at the end of the day, when she
left me and walk the field, in the end, she will eventually come to
regret (in some ways I believe.)
In the first place, I think highly of my own relationship - I doubt
that would happen and even if it does - rather to keep a woman that
doesn't appreciate/love you, I rather she channel that affection to
someone else that she feels better with. If she THINKS that she is
BETTER OFF with him - I rather she go, but of course, once she go,
the chapter closed. There is simply no room to retrace her route
when she feel insecure in her new venture. 
Its has nothing to do with unemotional; when you widen your vision
in theories of love - the things you wanna possess, you free them.
You release them. Generally, people holds it. Paradoxically,
holding them, sure you could make them stay? and me setting them
free, sure they would fly away?
P.S: I know I will be married; the difference is about the ultimate
end person. 
I don't believe in loving-too-much-cannot-lose-the-person,
loving-too-much-until-cannot-be-with-the-person AND
loving-too-much-cannot-be-friends-with-the-person. Superficial love
- we are all too self absorbed in our ways - question shouldn't
revolve about what we can gain from the relationship, rather what
kind of influence and impact could you impart to one another, so
that your partner can GROW and GAIN from the relationship. Noticed,
I mentioned nothing about myself because actually from this
process, I have already benefited. 
Cheers