Something I've yet to be seen or discussed on TRP before. Not being cheated ON, (TRP's stance is clear on that) but doing the cheating, then reconciling and returning the balance of power to your favor in an LTR.

Background: Her (19) and I(22) have been dating for around 5 months, everything had been great and she conformed to my expectations and respected my boundaries. Good LTR material; very low n-count, good relationship with her father, relatively ambitious and traditional. Slightly SJW/Tumblr-esque, but I accept that because those are the kind of girls I attract within my frame and subculture.

Context: Things were going wonderfully. Sex every time we saw each other, sometimes two or three times. She never hesitated to make room in her schedule to be with me, would almost always be the first one to text me or say goodnight. Good chemistry, flirting and romantic exchanges.

Then a few days before New Years, a notification from Tinder showed up on my phone when she was using it to play music. She flipped and started crying. I explained to her that I only had it on my phone to fuck around (partially true) and that I wouldn't have a problem deleting it because I expect her not to have any dating apps on her phone either and its the right thing to do in a relationship. I console her a little and then we fall asleep that night. The next morning she wakes up at 6:00AM to tell me she read through my messages (had NO idea she knew my password, should have been prepared for the consequences) and read all the exchanges I had had with other girls from Tinder and Ex-gf's, including nudes of them I still had on her phone. I told her I still love her and she has never looked more beautiful to me, but let her leave without chasing her. I give her space over the next few days without initiating much contact.

The day after new years I receive a message from her sister letting me know how much I fucked up, in addition to a wall of text from her detailing how much she loved me and how much I hurt her, and we have to break up. She deleted me off social media. I told her I still loved her too, assured her that I chose her to be in my life and that I'd be willing to fix it, but at no point begged her to stay or anything. I told her sister virtually the same thing as well as apologized (which maybe I shouldn't have). We are now back together and more or less picking up where we left off.

But certain things have changed. She doesn't text me quite as sexually or romantically as she used to. She sketches in her free time, and I notice all the sketches of me are taken down when I go over to "talk". We hash it out, each set a few new boundaries and continue dating, being light-hearted about the issue in retrospect. That night she said she "didn't want to have sex tonight" after I watched a movie at her place (even though we did after I did some reassuring and pushed past LMR). She said the same thing when we hung out yesterday but this time I just shrugged it off and went about my business. She's still the first to ask if she can see me and text me goodnight and she re-added me on social media (I haven't accepted all her requests yet) but I recognize I've seriously damaged an element of trust and desire in our relationship by cheating on her.

Closing: What I'm wondering now is what the best course of action to pursue is. She's obviously a lot more interested on what I'm doing and who I'm with now, which I'll tell her if she asks nicely. I'm always ready to move on if I still feel like things aren't working out, but she's still proving herself to be solid LTR-material and I'm still interested in pursuing a relationship with her for the time being. Should I run dread or amp up the mystery and play aloof until she picks up her original head-over-heels for me behavior, be a little more Beta and comforting while holding frame to demonstrate trustworthiness and maybe even apologize to her friend and sister, a combination of both?Or simply give things a little more time and see how they progress? I trust the advice of my RP brethren.