<human>: Condense the text into a few key points

About a year ago, I used my husband's facebook (he was right there, it was not snooping). When I clicked on the search bar, it auto-populated with his recent searches and I noticed that his ex gf was first on the list. This is an ex from a very long time ago and I have no reason to believe they've had much contact since I started dating my husband. It was not a big deal - he is obviously allowed to check on his exes once in a while. 

A number of months ago, I noticed that his FB was open to the same girl's profile. No biggie, right? But I was feeling a little insecure and I snooped on his recent searches - he looks for this girl every few days! And just as he can't stop looking at her profile, I now can't stop compulsively checking his facebook searches. 

My husband doesn't use facebook much, so most of the time he is only looking at her profile and no one else's. And I think he is looking at her before getting intimate with me. I don't know if jealous is the right word, but I feel sad that my husband has his ex on his mind so frequently. It also makes me feel insecure that my husband apparently doesn't think that there is anything wrong with his behavior. 

Should I bring this up? Am I wrong to be upset? Should I just let this go?
<bot>: My husband checks his (long ago) ex's facebook profile every few days and I feel insecure and bad about it.