hey lola i'm really close to my brother who is a Gemini sun / Cancer venus with an Aries moon (Scorpio and Aries are both ruled by mars so that is something the moons have in common) and i also once dated a Gemini sun with Scorpio moon so hopefully I can help out a bit.
my brother is extremely loyal to his partner and his family. he has been with his gf since they were 17, so 8 years in total.
he is a real homebody. me, a taurus, i socialise way more than he does and have a larger circle of friends. he used to hang out with the boys more but in the past 3 or 4 years he sees them now every few months or so. he'd rather be at home working on cars or watching tv or cooking. he's happy for people to drop by though but doesn't like travelling or being too far from home.
i can't speak from being on the receiving end, but i did live with them for a year so know the dynamics.
his gf is a Pisces, at 0 degress, and shows a lot of Aquarian traits.
he will not commit to marriage with her, yet. he is unsure about their future and worries if he is making the right decision or not. he definitely still shows the Gemini dual personality/moodiness, but she pushes his buttons and threatens to leave because he hasnt proposed yet (which is just digging the hole even further for herself because the more she harasses him, the more he wonders if he is making the right decision). What i can tell you is that he would never ever leave her, or cheat on her. she is a very headstrong, selfish and stubborn person, i am just being honest, but i can see that they love each other a lot. he just wants to make doubly, triply, quadruply sure that he is making the right decision when he does pop the question. he is an honourable and caring person, though can be very dominant as well... not sure if this is the Aries influence from the moon.
he also keeps a lot of frustrations and hurt inside for a long time and then explodes. (Cancer venus keeps it in.. he never forgets anything, and the Aries moon lets it all explode out... I would say this combination is like a bubbling volcano getting ready to explode and then bang! I am not sure the Scorpio influence would encourage explosion though, but I can tell its the Cancer venus that keeps things in, forever).
he has a romantic streak, except he didnt buy her flowers for about 5 years which caused some remarks when my bf bought me flowers when i was living with them lol. but he is a softie really, even if he forgets to do things like buy flowers... he sees himself as a provider and she lives in his house rent free, supports her while she is studying full time, all of that. so when she cries hard done by i think that's what makes him hesitate to commit to marriage. i can't keep up with their relationship anymore lol its too hard and up and down.. she is dramatic, he wants peace , but he is also a little bugger too when he wants to be. he still exibits the dual personality, but has some consistency about him as well, like.. he never wants to leave home for long periods of time. it's easier to coax him when food is involved though hehe (Cancer venus perhaps). he is more the dual personality in a childish, humourous way but can be a bit flippant sometimes, however takes the serious side of life seriously. he takes romance seriously. I am not sure if this is venus's influence in the first house though.
the Gemini sun /Scorpio moon guy i was with was also loyal but we had our own issues. in hindsight i don't think i was mature enough at that stage for what i wanted, but neither was he. he was definitely a sweety, but also very flirty. he wasnt particularly romantic but we spent almost every day together. we had a very intense relationship, which i dont think he minded, which is strange for a Gemini. my brother is very flirty too and boasts about it lol.. i think its a Gem thing. my last Gem bf was also extremely flirty.. just something you need to accept with them and i dont think it matters what their venus signs are.. as those three Geminis' venuses are Leo, Cancer and Taurus... all fairly loyal signs, but paired with a Gemini sun, did not dampen down the flirtiness one bit!
hope this gives you some insight into my experience anyway.