re-opening the lines of communication with an ex-girlfriend?

[Bob]

She dumped me for being too clingy after a 2 month relationship. It's been 6 weeks and there has been no contact between either of us, but we hang out in a group setting once a week. When she broke up with me, she told me i was the nicest and sweetest guy she had ever met and she really wanted to be "good friends" she ended up crying and asked me to stay at her house and we just talked as friends for 2 hours. I tried talking to her a few weeks later on facebook but she seemed un-interested, suddenly said gtg bye and went offline. She could have actually been busy, i didn't take this into consideration and just deleted and blocked her. She found out a few weeks later when i tried to re-add her and got really pissed off that i had deleted her. Since then we have gone 4 weeks without contact and it seems tense in a group setting. I still have feelings for her, but i think she may be angry at me...she said she really wanted to be friends, we ended it on good terms, should i text her, just congratulating her on getting her drivers license?