It's a
young relationship unaccustomed to its new future; your love is 4
months old, but it seemed that life before the relationship is born
is pretty vague. It seemed to me that you don't really know the
woman you are getting before jumping into a relationship. If she
has an unsettled affair/relationship with her ex, by knowing that
piece of information in the first place, would it change anything?
Possibly, it would caution yourself before devoting your time and
love into this BGR.
Interestingly, you are not really bothered by her act of
infidelity, but the question of whether she wants the relationship
hovers your heart. And what on earth are you encouraging her? A
love blinded Leo? Blinded by the affection and love this karmic
relationship brings forth and veils your senses?
Don't be a fool. 
If you can't bear to see her sad and since she loved
her ex, probably as much as you did to her, then what's holding you
back? What's
holding you back, if you truely understood what you just
posted?
You are likely a substitute/rebound for her ex and she played an
emotional parasite on her part. She wants to move on, but the
variables were: she got into a relationship with you and trying to
move WHILE handling you and her past simultaneously. This process
leeched emotional energy, mental strength and summon rain of tears.
Somewhat like a soul being captured by demonic powers and you are
needed to remove that vile thing. Of course, you will be drained...
probably to death, dry and parched.
She was never ready for a relationship with you -
this is a untold truth.
Why?
If love is in the picture, would that scenario ever happen? She
would probably struggle emotionally, but it could still be
manageable. Making out? Can't live without him? Leave you whenever
she found his presence? Is this the so called love you are
getting?
Don't be deluded by false love; she has made her choice. It's your
call.
Cheers
