Love / Dating a Polish guy. Do they cheat and have multiple women? [50]

This will depend on the particular Polish man you're dating. Some cheat, some don't. But Polish dating culture largely disapproves of cheating.

Love / Age difference in Dating a Polish - Is it ok for Man 27years to date Polish Lady 39years? [19]

As you've said, you wouldn't want to stop a relationship that has a good chance at being successful. I think you should give them the benefit of the doubt and not interfere too much in their relationship.

Love / What do Polish girls think about dating Asian guys? [134]

It is hard to generalize, each Polish girl has her own preference. A lot will depend on the girl's experience with Asian guys, or the experience her close friends and family have had with Asian men. But generally I think Polish women are open to dating Asian guys.