Should I tell my husband?

So my sons dad and I split a few years ago. We do NOT get along about 90% of the time. I know people always blame the other person but he truly just hates me and gives me attitude on a daily basis. We only get along when HE wants to because i'm always respectful to him because I simply hate fighting. Anyway, this morning I picked up my son from his house because he spent the night and my ex started hitting on me. He kept trying to rub my shoulder or back and when I would look at him he was giving me his smile he gives when he wants something. Not sure what he thought would happen because even if I wanted to do anything with him which I don't my son was there. I kept backing away from him and got my son and left. So my husband absolutely hates my ex due to his horrible attitude. He constantly is cussing at us and is always a jerk. I know if I tell him he hit on me he will flip out as he should I don't blame him. If you were in my shoes would you tell your husband or would you just talk to your ex and tell him not to do it again and move on from it?