Jealousy??

My boyfriends and I met pretty soon after him and his girlfriend of 3 years broke up. Me and him have officially been together for 7 months! Whenever he was dating her they lived together the whole time. They got pregnant but she lost the baby at about 20 weeks. My boyfriend says he thinks this may be a blessing in disguise that she miscarried. But they broke up out of no where. She had a new relationship posted on Facebook wishing 2 weeks of the break up and I met my boyfriend about 3-4 weeks after their break up. This kinda caught me off guard that he just ended a serious relationship and was ready to jump back into a relationship so quickly but our connection and our chemistry was so strong that I didn’t let that hold me back. Within 3 weeks he told me he was in love with me and that he knew he would be marrying me someday. My feelings are so strong for him and I am pretty convinced that I could spend the rest of my life with this man. He had given me so much respect and love. He is the first guy Iv ever been with that I felt so secure with!

Even though I am so happy in my relationship I fear a lot of times that this woman whom he spent so much time with will pop back up in his life. I don’t know why I fear this but it’s always bothering me. Iv looked up her Facebook and she is so super pretty. I just feel like their break up/move on was so quick and they didn’t give themselves enough time to be alone that maybe their feelings for eachother didn’t completely go away or something and maybe one of them will text the other one day randomly and they will reconnect. Why do I fear this??? I trust my boyfriend but it’s hard to know he wouldn’t talk to her since they went though so much together. How could they both move on so quickly without any time to be alone? Please tell me I’m crazy and overthinking!