Ronaan:
Your ex didn"t realize that you are "the one". She saw you possibly with another woman, when she currently has no other man, and the human fear of loss kicked in and drove her to get you to sabatage your current romantic interest. If she had discovered that instead you were at home reading war and peace instead of seeing women, I"m willing to bet large amounts of money withot even knowing either of you that she would not be begging you to get back with her.
You also ARE being a vagina with the ex. Letting her see u at work and JESUS letting her convince u to call back the new girl is fuckin horrible. Not only do you let your ex make your decisions for you and ruin a possibly good thing, bit that pussy behavior is exactly what will ruin the relationship even if you get back together.
That"s why being a pussy is lose lose. Many guys are pussies because they don"t want to lose their demanding controlling soulstealing girlfriends, but exactly what makes a guy end up with a girl like that is the same thing that makes her not respect u. That"s why those types of girls are fucked in relationships.
Grow a pair and decide what you want,rationally, and stick to it. If a girl continually tries to manipulate u it means you have already given in in the past. A girl won"t try that shit unless she thinks it might work.
Unrelated, I have been in korea for a bit over 1 month now and it took a bit but I met a very cute k girl. I had girls in the USA somewhat down and understood, but it"s a whole new game here. Nothing to say right now and eventual naked pics are unlikely but try I will.