I knew it was there   Though I tried to hide it   The feeling just kept on shining through   Haven’t known you that long   So I try to deny it   But the feeling was much too   Much too strong      Could this be love   Deep down inside   Tearing me apart   I feel it in my heart      Constantly, you’re on my mind   Thinking about you all the time   I can’t sleep no matter what I do   I just keep on thinking ‘bout you      Why do I feel this way   When I know you have someone   That you’re seeing each and everyday   Should I play this game   Of just being your friend   when I know that’s not where I want it to end      How could this be wrong   When it feels so strong   Tearing me apart   I feel it in my heart      Constantly, you’re on my mind   Thinking about you all the time   I can’t sleep no matter what I do   I just keep on thinking ‘bout you      Constantly, you’re on my mind   Thinking about you all the time   I can’t sleep no matter what I do   I just keep on thinking ‘bout you      Now I don’t want to start   No trouble   Between you and I and you lover   But I must tell you what I’m going through   Everytime you walk by   I see love in your eyes      You're on my mind   Keep on thinking about you, love   i just keep on thinking 'bout you      Constantly, you’re on my mind   Thinking about you all the time   I can’t sleep no matter what I do   I just keep on thinking ‘bout you