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This is really hard for me to answer because I don’t know your situation. I think you need to weigh the pros and cons. If you confront him will it accomplish anything? Will it help the situation? Will it make things better? If you let it go can you actually let it go? Can you give him the benefit of the doubt? At the end of the day, if there are real concerns and real reasons e doesn’t like your partner, maybe it’s something to consider. But if it’s just a conflict they have or a difference in personality or anything like that then the bottom line is that you have to choose who you’re with… It’s not up to anyone else. Good luck!!!