Getting back together after divorce

My SO and I were seperated for a year, and during that time we divorced. we seperated because he was always angry and raging at little things which was so unlike him I thought he hated me. The entire year we spent apart I still thought he hated me... so I applied for divorce and since he didnt fight it it seemed like what he wanted. I didn't touch another man the whole time we were seperated even though my family kept pushing all these guys at me. they werent him, and it hurt to think of anyone taking his place. but an old friend of mine kept trying, and my SO sent me a message about all these girls coming after him so I thought if he moved on I should too. i said yes to dating the friend. but I knew I still loved my SO so one day I asked him why he hated me. it took him by complete surprise. he said he thought I hated him! and that he wasnt good enough for me and he was on pain pills that the doc later found out made him have major mood swings. we went over everything that happened and realized it was all a huge misunderstanding. we both were so sure the other one wanted out that we never thought to ask. his mom knew, she kept telling me to stay. once we talked it was like everything flooded out, and when he dropped off our daughter his face looked so open and broken. he had said yes to dating someone too and she had forcibly moved in. i broke up with my friend (who completely understood) and he broke up with her. she punched him 3x and pulled out a gun saying if he left her she would kill herself. ... she finally accepted it and moved out a week later (took her that long to find a place) now she keeps texting him. and he says they became such good friends over the year I was gone that he forgave her for everything. he said the only one in his heart is me, and I know that i can feel it so deeply i wanna cry. but ... she keeps messaging him things like she misses how he spoiled her.... and after a year alone I feel so insecure now. i feel like what if I am no longer enough? but today I found his old phone that he had been using all year until this week. and there were 10 old photos of me on there still that he had taken before we split. and now my heart is overwelmed. how do i get rid of this insecurity? i dont want it to burden him