On the plus side, you sound like you are leading a pretty active life. Definitely more than I am. As far as your ex-GF goes, she may be right. Finding sobriety is very difficult and must be your number one priority right now. Nothing else matters without it. It's life or death, whether you realize it or not. Most inpatient rehabs, (AFAIK), insist on it's patients avoiding getting into any relationship until a person has many months of sobriety. On top of that, if your ex is still partying/drinking, honestly, that sounds like it could be a disaster waiting to happen for you. It's terrifying and hard to accept, but to stay sober, you may have to lose more than her and will eventually, get new friends who will be committed to your sobriety. Loneliness is often part of this. You go to meetings, you said, but do you have a sponsor? AA meetings sound like a good place to meet knew people with some sobriety, who know exactly what you are going through.