@Hamayun,
To simplify this dilemma:
1. This guy added you to a dating site, you weren't already there looking for someone.
2. He was up front with you about his already having a girlfriend yet he was willing to exchange phone numbers with you.
3. He told you up front he wanted to take it slow and not become involved because he would be studying abroad and already had a girlfriend.
4. Even though he wanted to keep it casual, you continued to talk via phone and text and even met in person while he still claimed loyalty to this other girlfriend.
5. He kept you strung along by telling you he loved you, even though he had another girlfriend.
6. He even suggested a second meeting after telling you he was committed to his girlfriend.
7. All this happened in just a few weeks of friendship and you are wildly crushed by his decision to end the friendship so he could prevent the temptation of something happening between you.
Why exactly is it you are upset and who is it you are upset about?
Are you upset at yourself for allowing yourself to be sucked in and strung along by this guy falsely claiming loyalty and commitment to another woman while testing the waters to see if there was something better around the corner? If not, you should be.