Would you be able to move on from a 10 year relationship to marry somebody else?

She is marrying me due to parental pressure leaving her 10 years of relationship. She says she will be able to move on and will be happy with me. But i see sadness in her sometimes for her past. She wasn't in a declining relationship but had to come out. Has anyone been able to carry this type of situation successfully?

Would you be able to move on from a 10 year relationship to marry somebody else?
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