#Background

I have been with my girlfriend for 5,5 years by now. We love each other, it was a really great time, but not without downs of course. And one of that downs happened 8 months ago. I think I had some kind of depression back then. I was unable to feel anything, nothing cheered me up, I started giving up on everything - college, training and most importantly - my relationship. On one of the parties I participated, I drunk too much and did something stupid - (almost) kissed with a friend of mine (that was barely a stub, but it happened). Didn't tell about this to my girlfriend. Then I lied to her for 3 or 4 times that I am out somewhere but in reality I went to meet that friend. And that was the problem - I did lie and did not tell everything (she found out it when she read my messages I sent my friend when I left my phone home - I don't blame her for it, it happened only once).

#The problem

At that party, it could have been anyone. Unfortunately, it hit on my friend. Now keeping in touch with that friend is not welcome (which seems somehow reasonable). But my girlfriend does not trust me in whole (at least not as much as before). Now I have nobody (except my girlfriend of course) I can truly talk to.

#What I want to achieve?

I want to rebuild trust in me. Convince my girlfriend that all of that is past now. Explain that the reason I did those bad things was not that friend herself, but whole the situation I was in. Finally, I would like to be able to meet my friend freely.

How can I rebuild the broken trust with my girlfriend while still hanging out with my other friend?