Is it true that 'Old love comes back without being invited'...?

Now she has a family and two children, which should be enough to make her happy, but she used his date of birth as her birthday on her personal page.

I am a girl who has just turned 20 years old, and I know him, a man who is almost 40 years old. Before, I heard that he had gone through several love affairs, but the most memorable love affair was probably his ex-girlfriend who had been with him for 10 years. When I first met him, he talked about that girl a few times, it sounded like they were very passionately in love. She is now a dozen years older than me, so I must have been too young when they were in love. According to him, they broke up because their long-standing feelings gradually faded and because her family did not get along with him, his family also firmly opposed her dating him.

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In every aspect, I am very confident, I feel better than her (once I accidentally saw a photo of the two of them together). Therefore, his love for her must be very sincere. I am also a girl, somewhat jealous of his past relationships. He loves and cares for me, I completely believe in his feelings because we have been engaged, and will get married in a few months. Everything could have gone very smoothly until I accidentally discovered that I had added her as a friend on my personal page.

Now she has a family and two children, she should be so happy, but she used his date of birth as her birthday on her personal page. I'm so annoyed, if she's so happy, why does she still miss her ex? And her brother and sister often call to show off her life to my boyfriend. In the past, he also asked to break up, I heard she was very miserable, and there is a saying "old love comes back without being invited", so she must still miss my fiancé a lot, right?

According to Ngoisao.net