Need some advice.

So I'm the first o tell anyone my marriage is far from perfect. We have been separated twice and both have been with other people but we have found our way back to each other and now I feel our love and relationship is stronger than ever☺️ but lately I've been getting the feeling he's settling. Mainly because I keep seeing where he keeps searching and going through an old fling of his when we were separated on Facebook..

I deleted and blocked any information I had on my old friend and he didn't do nothing. I ha for remove "them" off of Facebook for him. Because he told me it wasn't necessary they knew we were back together so I was over reacting. ( I still deleted them) may I add we have been married 4 years together almost 5 we each have children from a previous relationship and we're trying to have one of our own. But if he keeps doing this I feel like he's eaither cheating and hiding it really good or he is just settling.. I don't know what to say or what to think I'm worried about our marriage and kids. I don't want to get pregnant and then end up divorcing. Help me give me some kind of relief