Me and my girlfriend got together on April the 13th, all was going fine and I started falling for her. By the end of June she confessed to me that she had kissed her ex the day after we got together (April 14th). I was somewhat hurt, but i didn't make a big deal out of it since then things were going good.
She lives with her parents and her brother, who became best friends with her ex not so long ago. They knew each other for years, but started to hang out in the last couple of months. Her ex often comes over to their place because he is best friends with her brother.
Her ex is still into her. Her ex's other friend, with whom I used to hang out, used every possibility, when our relationship was a bit down, to try to talk her into getting back with her ex
I don't know what to do or if I should break up with her. I feel like she is doing something (cheating), and I am definitely not okay with her ex coming to their place. She tells me that I am the most perfect boyfriend and that she loves me very much but I have tough time believing she means it.
P. S. Once in the middle of August i accidentally caught her. She'd hung out with her brothers friends (including her ex) and she tried to hide that from me.
Guys maybe this is not the right place to ask this, but I'm in desperate need of advice and i would be VERY thankful if anyone helps me ♥️