Solid start. The internal conflict narrative, possessive husband (she's only mine) vs. also want to see her with someone else, the 'fear', so true...

I see the comments about switching to Ren'Py, +1 to that vote.
The art...it's easy on the eyes, and don't have a problem with it in general; it's a little different, unique, but good.
However, 2 things stuck out to me, and I don't usually fixate, notice, or get distracted by 'unusual' or non-typical art...
1. Lisa's torso...most times it's fine; others, like a giraffe's neck. Again, different style, not necessarily bad, just different. I'll probably get accustomed to it, but for me to notice and comment, it's really noticeable...lol
2. The freakishly long bed, and I've seen standard XLong dorm beds made for basketball players... I couldn't help but think Lisa needed it to accommodate her torso...
Overall, the art is good, and it wouldn't bother me if dev sticks with Lisa's abnormally long torso in those few renders, but this is one of the extremely rare times where something about the art caught my attention as, peculiar...
The story, writing so far, excellent.