how can i tactfully tell my friend...

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...that her partner is looking for somewhere else to live? My friend of over 20 years is having problems with her relationship. Her ex husband left her couple of years ago for her best friend and although i had an idea what he was playing at, i never told her til after he left cos she was blaming herself. I helped her back on her feet and even found her the guy she's with now! However, i've know for a few months that he's still going on dating sites saying that he's single and looking for someone. He even sent my workmate a message knowing that we work together! I havent told my friend about this but agreed to try talking to her partner. I spoke to him last night and he said that he cant cope with her mood swings and is looking for somewhere else to live but would still like to stay in a relationship with her. She left the pub in a mood last night at about 10pm whilst he refused to go after her and was still there at 1am! Seems to me that he's used her just for a roof over his head but she's been so desperate for a man in her life!