DEAR ABBY: I’ve been married to my husband for 30 years. For the past five years, I’ve noticed that he is acting a little different. He’s lost a lot of weight. I found out he’s been smoking drugs. He had this problem years ago, and I thought we had it beat. But now I’m getting the impression that maybe you can’t ever beat it.

I put it in his car to see where he went, and it showed that he went to an apartment building and was there for almost an hour. I don’t know who lives in that building, and I have never been there. I suspect that he’s cheating on me.

Their wedding anniversary is coming up, and we usually send a card and money. What would be appropriate for me to do for our son-in-law? I would like to send a card letting him know I’m thinking of him,