The Difference Between ていて and ている?

[Fuubuu]

This has been bugging me for a while now.
How does
私は考えていて。
differ from
私は考えている.
Someone told me that ていて turned the verb into the present progressive form but doesn't ている do the same thing?

Any help is appreciated! Thanks!

 

[Toritoribe]

私は考えていて。 doesn't make sense as a sentence (well, at least as a stand alone sentence without a specific context). Where did you get it from? (Or, maybe you made it?)

 

[Fuubuu]

私は考えていて。 doesn't make sense as a sentence (well, at least as a stand alone sentence without a specific context). Where did you get it from? (Or, maybe you made it?)

Haha I made it, sorry about that, here is a sentence from the manga I am reading.
それが何でだったんだろうなって考えててさ理由も言わねぇし

 

[Toritoribe]

The -te form is used to explain the reason/cause of what is mentioned previously.

 

[lanthas]

Maybe a mispronunciation of 考えて(い)た? "それが何でだったんだろうなって考えていたさ。理由も言わないし。"

 

[Toritoribe]

考えててさ is correct since it perfectly makes sense there, unlike the awkwardness of 考えて（い）たさ.