<human>: Can you condense the text into three sentences or less?

So my gf was crazy about me for nearly 2 years. In that span she had 2 boyfriends and we became the best of friends. 

During that span of time I was dealing with really bad depression and confidence issues so I was not ready for a relationship. I could not do relationships so I chose to be friends with her because I cared a ton about her and we had a lot in common.

Towards the tail end of those two years, maybe a year and a half into this. She had a boyfriend and I had finally recovered from my depression so I tried dating again and as my best friend, I'd tell her  about my attempts. My attempts never actually went anywhere. Never even kissed them. 

At around the 2 year mark she broke up with her boyfriend and we started hanging out more and eventually got together ^^YAY!

The issue now, 6 months into the relationship is that she has been having some, what seems like, depression issues herself. She says the root of them are that she doesn't feel good enough for me, doesn't understand why I'd choose her, is insanely jealous of one of the girls I went on one date with while she was with her boyfriend, she uses me as a complete support pillar and makes me the center of her life and a few other things in the same vicinity as the above.

For a long time I've been reassuring her that she's beautiful and that I didn't really chose anyone, I love her because of her and that the reason I could never have even thought of liking her before was because she had boyfriends but she says it's not the same thing because she wanted me for 2 years. 

This is my first relationship. I feel like I've done everything I can to help her get through this stuff and it keeps coming back and I feel like she constantly questions my love, which hurts since I try to show it to her as much as possible. I feel as though me being with her is unhealthy for her own good and I just don't know what to do about this whole thing. Please help.
<bot>: GF liked me for 2 years and had boyfriends but still questions my intentions now that we're together because of 1 girl that I went on a date with while she had a boyfriend.