Who to believe? I need help

So me and my husband of 11 years just recently separated as of last week so its very recent.

We are trying to keep it friendly since we have two kids and i honestly dont want it to get complicated.

Now here is my issue the last couple of days ive been hearing tons of rumors about him and this new girl that started there last month.

He works at a factory and i know a lot of people inside.

About 80% of them are saying that there is something going on between them.

Ive comfronted him since his excuses for leaving doesnt make any sense. But he is telling that nothing ever happened or is happening.

He has shared that he does see himself pursuing her in the future. Which totally broke my heart.

Now is he telling me truth? Did he cheated and thats why he is breaking up the family? Or should i just brush it up and not paying attention to rumors?

I am not even asking for alimony even tho i am totally entitled too. Should i?