I think I may be co-dependent particularly in relationships.

I recently have come out of an extremely volatile relationship. After the break up I was extremely confused at to why my gf acted like she did and why she treated me so badly. After searching online asking questions about her bahaviour I discovered a name for her behaviour narcissistic personality disorder which seemed to fit her behaviour perfectly.
This then made me question why I alllowed someone to treat me so badly and have done in other relationships in the past but couldn't end the relationship even though I was not happy in them. Whilst searching even obessesing over npd I discoverd co-dependency and I'm pretty sure I have many of these characteristics.
Firstly I seem to always particular in the last 10 years fall in love with girls with emotional problems or who have much drama in their lives I have this burning desire to rescue them. My ex said she wanted someone to rescue her yet when I provided every bar the money so she didnt have to be a webcam girl anymore she didnt seem to take my advise and this mad me angry and resentful of her.
Also I am extremely critical of myself, I never think I'm good enough in particular with my ex girlfriend I forever felt I was not good enough for her and this was made worse by her npd. I always expect my gf to lie or cheat on me. But not just in relationships in university or any walk of life I constantky feel people are judging me negatively.
I also have anger problems my ex would treat me badly and I would take and take it but then all of a sudden hand outbursts of rage directed at her or other people although I never hit her I would throw things around the room and scream at her and then Instantky feel bad after and want to make up.
Also even though I did not want to be with her anymore I couldn't bring myself to end it I felt like she was too good for me and no one will ever want me and I will have no one if I can't have her. When she ended it I gave sunk into a deep depression and have acted crazy trying to get her back even though I know deep down she wasnt the one for me.
I somtimes critise others too but I never mean it to be critical for instance I will moan all the time about the dinner that's given to me or be critical of my gf's modelling photos I never mean malice I think its just because I'm so highly critical of myself I think other peolle think the sane of course my ex being npd she couldn't handle any critiscm she would fly off the handle and go crazy.
The big problem I have is major trust issues when I was with my ex she did lie a lot because of her perceived condition because of this I was constantly trying to catch her out creating fake about ect on fb or her modelling sites.
I really want to get help and have a happy relationship for once. I know if my ex did have npd which seems highly likely then even if I didnt have co-dependency if wouldn't have worked but then I wouldn't have seeker her out or stayed with her in the first place. I'm now too frightend to trust or love anyone again because I never want to be with another girl like her. Even though I still obsess over her abd he's new fiancé.
Do I have co-dependency ? Please help me