He loved her so much when they were young but she didn´t love him that much, she wasn't very sure of getting into a relationship with him. Now decades have passed, she is "old and lonely" but he is married to another woman but he is still in love with her so he says he will always be there for her now that she is lonely and she has "lost" him in some kind of way...
Now that she is old and lonely she regrets the fact of her not being able to take the risk of getting into something serious with him when they were both young.
He loved her so much when they were young but she didn´t love him that much, she wasn't very sure of getting into a relationship with him. Now decades have passed, she is "old and lonely" but he is married to another woman but he is still in love with her so he says he will always be there for her now that she is lonely and she has "lost" him in some kind of way... Now that she is old and lonely she regrets the fact of her not being able to take the risk of getting into something serious with him when they were both young.