Similar story about dating someone. I'm gay and she was my first serious girlfriend. Everything was cool just dating but then things got more serious and she wanted to get married. I didn't, but I was also young, had low self esteem, was inexperienced in dating, and didn't know how to cut things off. Over time I just realized she wasn't the type of person I wanted to spend my life with. So I kept pushing back the wedding date. We were together 4yrs and about 4months out from the wedding when I found out she had cheated on me. That was finally my wtf are you doing moment and I peaced the fuck out. I often think back about how miserable I would've been had I married her, and I'm so thankful I got out when I did. Whew.

Edit: oh shit I also forgot how badly she wanted kids, like that was all she talked about and one of our biggest disagreements. Thank God I never got talked into that. Props to being a lesbian and kids not being an "oops" possibility haha. Childfree life for me!