Heat wave
The intense heat, both literally and metaphorically, that takes over the singer when they are with their loved one.

Whenever I'm with you, something inside
The overwhelming feeling of happiness and excitement that occurs within the singer whenever they are around their loved one.

Starts to burn deep
The passion and desire that the singer feels towards their loved one creates a burning sensation deep within them.

And my heart's filled with fire
The intense emotion that is felt by the artist towards their loved one, filling their heart and soul with burning passion and desire.

Could be that I'm very sentimental
The artist acknowledges that they may be seen as overly sentimental or emotional when it comes to their love and affection for their partner.

Or is this just the way love's supposed to be?
The singer questions whether this overwhelming feeling of love and passion is simply a natural part of being in love, or if it is unique to their relationship.

I got a heat wave, burning in my heart
The intense passion and desire for their loved one that the singer feels is like a heat wave that burns within them.

I can't keep from crying, tearing me apart
The artist is so overwhelmed with emotion towards their loved one that they are moved to tears, but at the same time, this intense emotion is also causing them pain and heartache.

Sometimes she calls my name, yeah, yeah, yeah, I can't explain
The artist's loved one has a powerful effect on them, even the mere sound of their partner's voice saying their name can leave them feeling speechless and overwhelmed.

I feel, yeah I feel, I feel this burning flame
The artist is consumed by a burning desire and passion for their loved one that they can physically feel within them, it is an all-consuming flame.

This high blood pressure's got a hold on me
The intense emotions and desire that the singer feels towards their loved one has a physical effect on them, causing their blood pressure to rise.

'Cause this is the way love's supposed to be
The artist is justifying their intense emotions and desire for their loved one, suggesting that this is the natural experience of pure, unadulterated love.

Just give me another chance, this could be a new romance
The singer is requesting their loved one to give them another chance at starting fresh, potentially beginning a new chapter in their existing relationship.

Oh yeah
An exclamation of the overwhelming feelings of love and passion that the singer feels towards their loved one.

Heat wave, heat wave, heat wave, heat wave
Repetition of the chorus, emphasizing the intense heat and passion that the singer feels, that it's not a one-time occurrence, but a continuous, all-consuming experience.