<human>: I've been relatively single for the most of my life.  I had my last relationship (more than just a few dates) when I was 22 and it lasted a bit over a year.  

I met this current SO overseas and since then we've had 3 occasions where we've hungout.  She's recently left visiting me for almost a month long period.

SO told me upon leaving, "I think I love you" which she felt was strange to say and I told her it wasn't.  After that we sat quietly, holding eachother while she weeped from being upset about having to go.

I don't know what/how to feel.  I've been single and searching for a long time and i've watched my friends get married over these last years in relationships I feel aren't great (who am I to judge?)  but I can't help but internally criticize them.  

I've dated a few that i've regretted leaving.  But it was only years later that i've come to "Oh, I had something great and left it behind" but I also think "Well, I wasn't 'feeling it' so how could I force something like that?'"

I don't know if i'd be forcing or allowing something to grow.  It's troubling as i'm rough on myself and worried i'll miss out again.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Long distance SO and I have had 3 periods of 2+ weeks hangout.  Last hangout she confessed potential love.  I'm unsure how to feel.