My GF (23) and I (24) have been dating for 3 years and for the first few years it was a fairly decent relationship, spent plenty of time together going out on dates, exploring new places, and getting to know each other. She's the first person I've dated and I loved her very much although we share very little common interests. We used to to be quite sweet to each other initially, giving each other cards and gifts regularly to show appreciation for each other but in the last year, I feel that both of us have grown lazy in the relationship and are putting less effort in. It's also helpful to note that we're both overseas students studying in the same degree so we have spent a lot more time together than most couples
Now, this year, due to study requirements, we are living together in the same house with another 2 mutual friends (both female) ( All of us used to stay seperately). Now, I'll be honest and say that I've had some feelings and physical attraction towards one of those friends (lets call her Shelly) in the past and I feel that we've had some chemistry but I act on those feelings as I was happily committed my current relationship.
So as you can imagine, living together with the GF and seeing her constantly with very little to do(we've moved to a small country town), has meant that we've had less opportunity to go out and explore new things and areas. In addition, the increased contact with the GF has resulted in more of her ugly sides to come out, mainly that she's very petty and gets upset over little things. I've also come to realise that I find our conversations terribly boring because we have very different personalities and she prefers the day to day topics like gossip and k-dramas but I'd rather have discussions about politics and world events and things with a bit more substance and i sometimes feel that my GF is a wonderful woman but she can sometimes come across as being air headed.
Enter Shelly, she's beautiful, intelligent, plays musical instuments (a quality i really admire) and of course single and living with me. Naturally, given the proximity of being housemates, we've gotten to know each other a little more over the year and I can definitely feel myself falling for this girl. I'm not sure if she's into me or if she's just being a nice person but she doesn't tend to share much but is always happy to join in a conversation about politics etc, go out for a game of badminton or explore somewhere new. I've been talking to her a lot more recently over text and there are times she seems like she's interested but there are other times where she doesn't so I'm not sure if she's that way because she knows i'm in a relationship and doesnt want to overstep her boundaries.
So to get to the point really, I'm not 100% about my current relationship with the GF and i'm not sure if I should end the relationship. I'm very aware that the other girl is having a huge impact on my life in terms of what I'm feeling for her and the diminished feelings for my GF. Part of me wants to continue to try to make things work with my GF at the moment but I have felt less and less attracted (both physically and emotionally) to my GF and its been a source of real concern. I just don't really want to go through life thinking 'What if i had just tried to date Shelly instead of sticking it out to try to work it out with my GF" Looking for some advice about the whole situation and what is the best thing to do :/
TLDR*; Not sure about 3 yr relationship with GF, losing feelings and patience for her because of petty behaviour and incompatible conversations/interests. Wondering if should end the relationship and if my thought process is totally out of whack due to other girl i'm falling for.