LOL, I can relate to that so much. I can't for the life of me fess up what I feel for a person in fear of ruining our relationship. XD
I fell for an ENFJ about a year ago. I've never had someone relate to me on the same level as her and sometimes we do things at the same time without us planning it. We called it an "Empathy Link" lol. XD She was a really fun person to hang out with and we talked so much about things that interest us. The third time we talked, I immediately realized where this was heading for me and I wanted to tell her... but something told me I shouldn't.
I found out she was straight.
And damn, I respected and loved her so much to not tell her to change her sexual preference for me, or at least consider me. I loved her so much that all I could do was let go and let her live her own happy life. And the fact she wanted a family and get married so bad, I just couldn't take all of that away from her. It would just be too selfish for me that I'd rather take all the pain and just forget about it.
I eventually did, but after nights and nights of crying. And it doesn't help that she ran to me when times were terrible for her. When I thought I'd forget about it, she comes running back in my arms, crying for whatever reason and it just crushes my heart slowly. I couldn't tell her to just leave me alone, not in her most fragile times. And what pissed me off more was the fact that she ran to me crying about the guy she likes which is apparently one of my best friends. And this dude was a total douche-bag with her. I completely didn't know what she saw in him cause he was this really lazy person and he wasn't even cute to begin with.
Ok, I might be biased, but please. He liked someone else and they both ended up with each other (him and the girl he liked, not ENFJ). I had this internal conflict with my best friend because he knew how I felt about ENFJ, but he continued to be a total ass with her and eventually everything comes pouring out at me.
ENFJ moved on, I moved on. We're all friends now and well, I'm going to take a break from love. After this pain, I don't think I want anything to do with it. At all. Even if I am slowly being captivated by this new INFP friend, I'd rather just let it lie low for a while.