How can I lay a foundation of trust and communication with my friend after things got muddied between us after asking her out and distancing herself?

Watdsas

To make a long story short, we're both 30, work together, and she asked me out last year after her breakup, we had fun, connected, flirted and touched each other a lot over a nice long dinner but the night ended weirdly in her bed. Weeks after I asked her out, she said yes but changed the day many times due to mental health problems and chronic cramps from another medical condition that she had told me about, until I just stopped and we practically stopped talking

Out of respect for her since that's what she showed she wanted

Now she's suddenly wanting to talk a lot again, stopping me when she sees me, calling me her best friend telling me she loves me taking pics of us and getting comfortable around me again. She's told me she loves me before and I've never said anything close back and therein I feel lies the problem, while great friends we've never communicated well, from going out the day she had a breakup and it ending sourly on her bed, to randomly asking he out without talking about how we feel, or what we're going through

She seems to want to be back in my life and I wanna keep it that way, meaning I have to be open and honest with her about how I feel, right? And hopefully she does too? Again I feel it's a problem for both of us but I might be wrong..

I want to keep her friendship since it sucked and hurt not to talk to her for months and right now I'm so happy and wanna keep it that way. I want to keep that bond strong or even stronger for whether we become just friends, which I'd be fine with I think, or with more, which I only started to consider after she asked me out that first time

Regardless, that foundation matters most no? How can I begin to achieve that, just telling her? Having "a talk" with her? Call her something special and she often does or explain how much she means to me?

How can I lay a foundation of trust and communication with my friend after things got muddied between us after asking her out and distancing herself?
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