So I just ended a relationship with a girl I've been talking to for about 3 months. Lost my virginity to her and she was my first for everything. On Friday she met up with her recent ex which she told me they were going out to eat. I find out they chilled in her dorm all day, smoking, talking and watching movies. That didn't sit right with me and I told her that was mad disrespectful to me.

Yesterday on Christmas Eve, the vibes wasn't right because I was mad at her. I told her I wanted to go home after work. After I did get off I asked her if she was home indicating I want to come over. She told me she made plans with her best friend which seemed sketchy to me. I started question her about her plans and she told me I was being annoying asking her too many questions. On Christmas morning she texts me, "Merry Christmas Babe!!" with hella emojis and also called me 3 times. I didn't answer any of them cause I planned on breaking up with her. Anyways, the emojis and the babe on the text seemed sketch cause I've woken up to a charismatic text like that. It felt like she was compensating for something she did.

Later on that day, I ask her if she really did chill with her best friend and she tells me that he flaked and chilled with her ex again in her dorm that night. So basically I'm heated, cause I feel like she chose him over me on Christmas Eve and knew I wasn't okay with her chilling with him. She says I didn't "set the boundaries". So I said fuck waiting till she gets home to break up with her in person and did it via text. Along with this situation I've been feeling like the relationship was gettin redundant and she has some bad habits I really can't deal with like being sedentary and eating like shit. Despite that, she's a good person and treated me good. I never felt really secure in the relationship with her though.

So basically, I'm making this thread to ask, are those legitimate reasons to end it or should I give it another try and try to fix things? Am I overreacting or is my reaction justified ?