Unsure

I'm a bisexual single mom. My kids, since they were young, we've been open about everything- including sexuality and sexual curiosity. None of this was ever explained or approached inappropriately.... the problem is my 16 year old thinks that anybody involved in a same sex relationship became that way from being abused. I was left speechless when he said that. We talked a little about it and he is 100% against anybody in a same sex relationship. When my kids were younger, I was dating a man and I had a married gf. That dynamic worked for us. Eventually she and I broke up after 6 years. I've been chatting with another woman and I would love to go out with her- but I'm apprehensive. I don't want my kids to refuse to hang out with me (or "us" if it developed into something). I feel trapped. I'm not sure how to approach the subject because I've always told them if they were bi, bicurious, straight, whatever- it was fine as long as they're respected and happy.