Is it time to throw in the towel?

I've been married for 20 years and have 2 kids. My husband is a very self-absorbed, OCD person and always has been. Whatever he does, he usually gives 110%. That usually included me. He used to do very sweet, thoughtful things for me with no prompting, he used to tell me how pretty I am, etc. He is a very attentive father and I have absolutely no issues with him in that regard. He just doesn't seem to be that into me anymore. I have done everything I can think of to put a spark back into the marriage. Unfortunately, nothing has worked. I've tried talking to him about my feelings, but he either belittles them, or tells me I'm paranoid. I have felt this way for a long time now and keep hoping to see a glimpse of the husband he used to be. I'm sure I don;t resemble the cute, young girl he first married, but I'm not a pig either. He goes on and on about how well HE has aged and all the attention he gets. I've had told him that it bothers me when he talks like that and that it sounds as if he's having a mid-life crisis. Again, he belittles my comments and tells me that I'm jealous. Not sure what else I can do, if anything. Any suggestions?