Tried to break up with gf, she wanted to work things out, promising to change and be more trusting, just 48 hours she does the same things from before

Hi 25/M and my GF 24/F, have been together about 3 years now, over the course of the relationship, we have had our ups and downs, same things every couple has. However I wanted to break up with gf for the 3rd time in the last 3 years. I just don’t believe in it. 3-4 weeks ago she wanted to break up cause we have been distant, I work 6 days a week mornings, she works nights. In my time after work I go to the gym or tinker with my motorcycle or cars. And I was perfectly ok with it, I had wanted to break up and pretty much just said “ok” did not go to well, guess she wanted me to fight for the relationship and etc, we didn’t make up really, thursday of last week I wanted it to be over officially. Sent a long text recapping the reasons that she wanted to break up and inserted some of my reasons, she texted me 2 days ago to talk and make up and wanted to stay the night (bad idea looking back at it now)

We talked and to put it long story short, she said she would make changes, with her being very insecure and starting to trust me and that we would talk things out more, I was hesitant but eventually agreed to try again. she stayed the night, and I did not want to engage in sex at all, she engaged it completely and kinda forced it on me. So we did. Afterwards she got quiet and depressed “because she felt like she gave it up too easily” I tried to console her and make her feel better and I did. Went to sleep and she went through my phone and started questioning me about “ where I have been going” “who is this new girl on your friends list” “why did you laugh about this being single post”

I was very annoyed of course, I have told her before to ask me to go through my phone if it makes you feel better, but every single time, she waits until I sleep then goes through it then I wake up looking for my phone to be interrogated by her. I have nothing to hide, but I hate when she invades my privacy, she has my password and tells me to go through her phone if i want, but I told her I do not do that. I dont care that she goes through it, would just prefer her to ask me straight up instead of waiting til i fall asleep to do so. I understand needing reassurance, she did end up apologizing and saying that it was wrong for her to do that, she never apologized before so I guess thats something

I reminded her how upset I was that she promised to change and “ be less insecure, and more trusting of us” to do the same thing within 48 hours. Her reasoning was “because she got insecure since she gave it up so easily the other night, wanted to know if I did stuff on our break”

What do you think guys, I am already having a bad feeling about this, should I just end things?? At this point? What would you guys do if it were you?

:tldr. Wanted to break up with gf, she promised to change and be less insecure/more trusting if she had another chance, just 48 hours she invades my privacy and does the same thing from before.