I think this combination (or Trinity is what you gave me) looks pretty good. Scorpio and Sag Suns are normally compatible, signs next to each other are. You are Scorpio, so are intense, sensual, independent, willful, and strong. You are emotional, but a little reserved at first. The Taurus Moon is opposite your Sun, but that's not a big deal. Taurus Moons are peaceful, gentle and kind. You are romantic and loyal in love (as are Scorpios). The Libra Rising is the facade you wear to protect yourself, but it's good-natured, and people find you friendly and personable. Libra rules the marriage house, so you want to be married someday.
One thing I see about your BF is that all three signs of his Trinity are mutable. This means he may be married more than once as he gets bored and changes very easily. So be careful there, as you take relationships more seriously than he does. Sag likes freedom, but is fun, outdoorsy, and is easy going, usually liked by everyone. This goes well with your Libra Ascendant. The Virgo Moon means he's sensible and a bit critical, but also witty, fun, and loves to keep busy. That's the most down to Earth part of him romantically. Gemini rising people are popular, love to try new things, smart, and good communicators.
Just make sure he's not communicating BS. I am a little worried that he's not as serious a person as you. This can be a good thing, as he can bring out your lighter side. But I don't know if you can count on him for the long haul. There are good points here, but just be careful, OK? There is potential for you to get hurt here, I'd rather see you with someone more steady. Let me know if anything develops, and don't forget ALL your planets are in a zodiac sign, in one of 12 houses which rule all the important areas of life, and many planets make aspects in your charts. And I can't see that here. So don't panic, just keep what I said in mind.