Cannot start system and GUI after updating

I had a few problems after a Windows 10 update, who deleted GRUB, and other problems trying to install GRUB again. I solved this problems after asking for help in this thread:

Now, after installing again the kernel, GRUB finds my installation and the OS starts, but I don’t know if it bootloops or if it is just a GUI problem.
If I start Manjaro from GRUB, it shows the ASUS logo, then the cursor for like half a second, and then again the ASUS logo, and this repeats forever.
If I start Manjaro from Grub2Win installed on Windows trying to start the system while GRUB was not finding the Manjaro installation, I can see more messages since it shows the boot terminal with all of the messages. Then it shows the cursor for half a second, and come back to the boot terminal, and also this repeats forever.
The last messages I get on the boot terminal are:

[ OK ] Started WPA supplicant.
[ OK ] Created slice User Slice of UID 620
Starting User Runtime Directory /run/user/620…
[ OK ] Finished User Runtime Directory /run/user/620.
Starting User Manager for UID 620…
[ OK ] Started User Manager for UID 620.
[ OK ] Started Session c1 of user lightdm.
Mounting FUSE Control File System…
[ OK ] Mounted FUSE Control File System.
[ OK ] Created slice system-systemd\x2dcoredump.slice.
[ OK ] Started Process Core Dump (PID 725/UID 0).
[ OK ] Stopped Light Display Manager
Starting Light Display Manager
[ OK ] Started Light Display Manager
[ OK ] Started Session c2 of user lightdm.
[ OK ] Started Process Core Dump (PID 783/UID 0).
[ OK ] Finished Network Manager Wait Online
[ OK ] Reached target Network is Online.
Starting TeamViewer remote control daemon…
[ OK ] Started TeamViewer remote control daemon.
[ OK ] Reached target Multi-User System
[ OK ] Reached target Graphical Interface.
Starting TLP system startup/shutdown…
[ OK ] Finished TLP system startup/shutdown.
[ OK ] Stopped Light Display Manager.
Starting Light Display Manager
[ OK ] Started Light Display Manager
[ OK ] Started Session c3 of user lightdm.
[ OK ] Started Process Core Dump (PID 990/UID 0).
[ OK ] Stopped Light Display Manager.
Starting Light Display Manager
[ OK ] Started Light Display Manager
[ OK ] Started Session c4 of user lightdm.
[ OK ] Started Process Core Dump (PID 1029/UID 0).
[ OK ] Stopped Light Display Manager.
Starting Light Display Manager
[ OK ] Started Light Display Manager
[ OK ] Finished Update locate database.

I saw that there are a lot of “Stopped Light Display Manager” and starting it again, so I’m thinking that the problem is with it.
I tried accessing other CLI with Ctrl+Alt+F2, 3 or others but I can’t.

To let you know what I’ve done before having this problem is:
I booted into a live USB and used manjaro-chroot to use the system.
I updated the system in order to reinstall GRUB, but somehow the kernel files were gone.
I installed the kernels linux54 and linux419 so that GRUB would find the OS again.
And that’s it. I just started Manjaro from Grub or Grub2Win and got this.

Someone have some ideas of what I can do to let my system boot? I can’t reinstall the system now since there are some applications with some configuration I made a long time ago and I need them all to complete my thesis.

Any help on this is appreciated, thank you!
If you also need other informations let me know.
Here are some system informations you might need:

`inxi -Mxa`

Machine: Type: Laptop System: ASUSTeK product: UX310UQK v: 1.0 serial: <superuser/root required>
Mobo: ASUSTeK model: UX310UQK v: 1.0 serial: <superuser/root required>
UEFI: American Megatrends v: UX310UQK.311 date: 04/18/2019

Manjaro was running with i3wm.