Buddy, I’m sorry to hear about what happened, and I know you now have great motivation to stay dedicated to a PE routine. There are a couple ways you can go about getting back, also. You don’t have a small penis. It’s a little below average, but don’t worry, you can bring it up.
If you’ve been doing the newbie routine this long, and have been honest with it, you should be able to add to it and do a few of the more advanced excercises. However, you should have a better feel for how your penis responds and it’s general health, by now. Remember to listen to your penis! You don’t want to overstress it by doing too much, so pay attention and experiment with excercises with caution.
If you’re willing to be patient, working on girth might not be the best thing to do, immediately. I only say this because length gains tend to be more difficult with girth increases. It’s your call, however, and plenty of members have done the opposite, girth first and then tackling length.
I’d love to be able to help you more immediately with the girl issue; she sounds like a major bitch. The only thing I can think of is if people bring it up, just brush it off like it’s not true and paint her to be the liar she is. You’re about average, and you’re not small, by any means.
If you’re worried about being thought of as bad in bed, learn to eat girls out and other sexual techniques like you’re a Kama Sutra GOD. When the next girl you hook up with can’t stop singing your praises, you’ll have the last laugh.
Speaking of laughing, if you can just laugh at anything that comes from her, and slyly hint at her own faults, it might help. If you still talk, or CAN talk to her, you can always confront her and ask why she would say stuff like that. Be the mature one and don’t lose your cool. Point out, “I don’t say anything that would make you feel insecure, though I wouldn’t be wrong.” The ultimate goal probably shouldn’t be to get revenge, but to make her feel like the bitch she is. I did similar with a girl that was toying with my emotions and then telling people about the skeletons in my closet, and I definitely felt better than if I’d just flat out spread shit about her. I stayed above the childishness (which is surprising, if you know me) and made her feel the guilt she should have felt.
Good luck with all this, and if I come across as preachy, my apologies, but I’d prefer you feel better than feel justly revenged, not that the two can’t go hand in hand…