Broken as present tense

" Broken " is past participle of break.

I have never come across that it can be used as present tense.

You can use broken to describe a marriage that has ended in divorce. (Sometimes it implies this is sad or a bad thing)

e.g. He spoke for the first time about the traumas of a broken marriage.
e.g. Children from broken homes are more likely to leave home before the age of 18.

In this case, "broken" is an adjective which has several meanings. For example:

a broken pot (broken = fractured; smashed) 
a broken set of books (broken = incomplete, fragmentary) 
broken sunshine (broken = intermittent, discontinuous) 
a broken radio (broken = not functioning) 

... and so on. This is the only case "broken" can be *** in the present te

what about:

"my relationship is tense at the moment, my heart is broken since my spouse cheated on me"

It's just the same thing: broken is used as an adjective. I didn't use any example of this kind because everybody knows what a broken heart feels like.

and adjective or not, it is still a reductive past participle.

the broken pot is on the shelf - also means, the pot that has been broken (in the past) is on the shelf (now, presently)

someone has broken telephone