how do say that you are really inlove with this person?

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Well I'm having a hard time figuring out if I'm really inlove or I need to be inlove with this person because it is a requirement. It's like I don't want to but I need to. Maybe I'm sick and tired of our relationship and I'm not happy anymore? So how can you say that you are really inlove and all? Like can you see yourself to be really inlove for a lifetime? Till death do us part kind of love?