Trust issues realization

OK so my and my bf have been broke up for 3 weeks now. I've always had horrible jealousy\trust issues due to previous boyfriends and somewhat bc of him. It's partly what ruined our relationship. I stayed with him Thursday and Friday night, well he went to the bar alone last night and stayed at a chick friends apartment as well. So of course my jealousy issues were full throttle all night and I only slept about 3 hours. When he got home he looked as of he had gotten beat up or something I realized I didn't care where he was or who he was with at all last night all I was worried about was him and what happened and taking care of him. I even called the chick he stayed with (who I've always despised) and asked her what happened and talked to her calmly and like I would a friend. I wish I could have realized sooner than these other girls don't matter and where he goes doesn't matter all that matters is I love him and care about him and I should've been more understanding of his friend choices and just maybe we would still be together