Can this marriage last?

My husband and I have been married for 23 yrs. We've had a rollercoaster of a married life, dealing with drug addiction and infidelity on his part and emotional infidelity on my part. Recently my husband has started treating me like I have some sort of viral infection that he doesn't want to get. Our lovemaking is mechanical with me being pushed aside after its all said and done. He didn't get me anything for our 23rd anniversary, just a somber happy anniversary. I gave him a gorgeous silver framed .portrait of myself in a beautiful negligee. All he said was thank you, no kissing, hugging or anything. Whenever I make amorous advances to him or show effection he brushes me off. Lately he's joined the wide web of facebook and has been contacting old girlfriends even to the point of calling one while I was in the room! He's got my pics on his web page, along with other family members, but i can't help but think its a smoke screen for other areas he may be dabbling in like emails I don't konw about etc..... I'm really tired of being and feeling hurt in this marriage, but he says we can't talk to each other & I've disrespected him as a man at times. Ok, so what do we do about it? He doesn't know is always his answer, but I'm tired of not solving problems and just going along to get along. Is he having a mid-life crisis or what? He says he loves me, but he shows no effection toward me. I've had a hysterectomy & my body & hormones have been out of wack lately, so I'm trying to get myself back into shape by exercising & eating right, I've even suggested we go to the gym together or walk, but he doesn; seem to want to do anything I come up with. He's stood me up a few times to see musicals and concerts. Can someone out there offer any suggestions , I'll take them all.