Sorry for the long post...
I have been friends with a male colleague for a few months now (I'm female). Over time, he's shown a bit of an interest in me, complimenting me, flirtatious comments, occasionally suggesting that we meet up after work etc. I did look forward to seeing him at work (We do get on really well, and talk basically all day whilst in the office) and I guess developed a bit of a crush.
He recently invited me out for an outdoor activity, which I accepted. There was no indication from his invite that sex was on his mind though, like I said, there was definitely a mutual attraction between us. We met at his shared accommodation and went to his room for a while where he started getting a bit touchy. He didn't have proper bedroom furniture, so we were on his bed (stupid of me, I know). I was a bit taken aback by the advances but didn't freak out or demand that he stop, and he eventually asked me whether I wanted to continue or wanted to remain friends. I chose the latter and he accepted. We left to complete this outdoor activity, which was briefer than I thought (and he was still a bit touchy), and returned home where he continued making sexual advances. Note that I'd already confirmed we should be friends only.
Again, stupidly, I didn't demand that he stop. I've been single for a long time, so I do admit that part of me enjoyed being held again, but in my head I was shocked it was happening and knew it was wrong. But, I was in his room, didn't want to make things too awkward, so I didn't firmly tell him to stop. I'd move his hand etc, but he would eventually restart what he was doing (fondling my b00bs, kissing my face, touching my body etc). We weren't naked at any time, but essentially had dry sex. This was all insigated by him. He could sense I wasn't fully reciprocating his advances so would stop for a while before continuing. When he wasn't touching me, he wasn't really interacting/speaking as often as we would at work, so it did get a bit awkward at times. Anyway, at the end of the day, he told me that he knows I want to wait until marriage before having sex again (I'm not a virgin, but am abstinent for religious reasons. He knew this way before we met at his home), and he couldn't commit to that (I knew this already), so he'd rather not meet up one-on-one again as he would just keep trying, and I'd keep resisting, which would annoy us both. He said we'd still be good friends etc but should only really meet as part of our wider friendship circle. I was a bit hurt at how quickly he said all this, but didn't say much and left.
I know I've been stupid. I'm planning to avoid the office for a bit and just regret the whole thing. Of course, I could have firmly told him to stop completely but didn't because I do like him, did partly miss being intimate, and didn't want to cause any awkwardness or tension. But, am I being completely unreasonable to feel a bit used? I was invited under the premise of an outdoor activity, which only lasted about 30 mins. The rest of the whole day was in his room. He always knew my stance on sex, so why invite me round in the first place? Just to say at the end that we shouldn't spend any more time alone? I haven't really been able to sleep well since (hence this post at 3:30am) and am trying to get over it before seeing him at work. I just feel sooo stupid and also used. I've been looking for a new job but am expediting my search now.
Any thoughts on how to process or handle this?