The past again and again

Hello everyone I have a problem that is making my life like hell. I am in a relationship from a distance with a girl, it has been 7 years. We are very happy in general, when we get together we have a lot of fun, our sex life is also great. But my problem is, back when we met I was working in a hotel as a summer job, she came to my country as a tourist. I liked her since I've saw her the first time, I thought she was very beautiful, I tried talking to her but I didn't get her attention, instead she jumped on another guy who worked with me. Well it didn't bother me that much, even when I met her as she was leaving his room the night after. After that she went home and one day she called me and told me that her "boyfriend" asked her money cause he was in trouble and she wanted to know if it was true. I told her the truth that he was just after the money and she broke up with him. She called later and told me she was coming back, and I told her I want to go out with her and she said we'll see. I have finished work but I went to the hotel to see her only to find out that she was already with someone else, It was a blow to my self esteem, I felt I was less than nothing. Not long after, she called me to ask advice as the second guy asked her for money!! I saved her again, and then she came over a third time and we've been together since. I still can't deal with her going out with this two and sleeping with them so easily, any photo I see of that time and I get depressed and keep picturing her with them then. Talking to her doesn't help cause she can't explain and she cries saying she regrets it but she can't convince me that I wasn't her 3rd choice. I know it's a mixture of jealousy, self esteem and I don't know what else but it has been bugging me like hell and I feel it's the only thing keeping me from being happy (Her previous relations don't bother me just this part of her life). I want to know if there is any healthy step I can take to improve my feelings about it or to get over it because I can't see myself leave her, not for this. If you need other details I did not mention I'll be glad to explain. Please no advices like suck it up or live with it, they don't help. PS sorry but English is not my first language. Thank you for your time and answers.

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