Anyways you did a good job. Keep going.

Tamam

Then, seni sevmediğimi, is the present tense. Isn´t it?

Thank you!

 Ex:Seni sevmediğimi düşünüyorsun.

1)You think I don´t love you.

2)You think I didn´t love you.

The time of the verb "sevmek" is unclear So we need an adverb of time.

Ex:Seni hiç sevmediğimi düşünüyorsun.

You think I have never loved you.

Ex Daha önce beni hiç sevmediğini düşünüyorum.

I think you had never loved me before.

I guess there is no difference between düşündüren and düşündürten. We also need adverb of time too. I have never thought about these issues.

But when you look at the sentence you see "don´t assume" It is present. You should think it is more logical to translate  the whole sentence in present tense if you have doubts.

I understood now,

Thank you for patience and clear explanations!