Am I being dramatic?

My boyfriend of 4years recently confessed about a girl whom he was seeing while I was pregnant along with his other baby mom but the thing is we moved into our town home back in November it’s now July I just figured out & he confirmed that she lives literally 5minutes or less from me , am I over reacting for being pissed off at my boyfriend because he knew she lived there and there is a possibility of me running into her or even him, me and the baby running into her and it’s a embarrassment also the girl admitted to being with him but had no idea about me