I (22M) reconciled with my ex-girlfriend (21F) whom I met in high school. Do you think it's a good idea?

I was a classmate of this girl in high school and we started a relationship at the end of high school. We were together for over a year, after which she broke up with me (she blocked me everywhere and never talked to me during that period). We were separated for 8 months, during which I kept insisting that we reconcile. We managed to start talking again after 8 months, and after about a year of just talking, we've now been together for a couple of months. The thing is, during the time we were separated, she dated and talked to several boys, and one of them she fell very much in love with. At that time, that guy was with someone else, but during the phase when me and my girlfriend were just talking, she was also talking to him. I know very well that later that guy also fell in love with her, but she refused him on the grounds that she is at a rather advanced stage with me. I know that the two of them are very attached to each other and they both regret that it happened this way. However, she chose me, but I have an insecurity about this. What do you think, do you think I will suffer from this?

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How long do you think this kind of relationship will last?
I (22M) reconciled with my ex-girlfriend (21F) whom I met in high school. Do you think it's a good idea?
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