Selena Gomez says she was prepared to adopt children if she didn’t have a partner by her mid-30s — a plan that seems to be out the window now … since Benny Blanco has arrived.

The singer talked about this with TIME Magazine — where she opened up about her getting used to being alone … this after being single for upwards of five years, and her coming to terms with the fact she might have to be a parent all by her lonesome.

As a result of that possibility … SG admits she was ready to bring a kid into her life, even if she didn’t have a man to do it with. She even had a time frame for this … age 35.

She says, “I was alone for five years, and I got really used to it. A lot of people are afraid of being alone and I probably tortured myself in my head for like two years being alone, and then I kind of accepted it. Then I came up with my plan, which was I was going to adopt at 35 if I had not met anyone.”

Then, along came Benny, and now Selena — who’s turning 32 this summer — is re-thinking things … including whether she’ll have kids with him.

We know he wants children … he made that really clear while on ‘Stern.’

Selena acknowledged the fact Benny is so open and that he wears his heart on his sleeve — noting she’s not really like that herself, saying … “I know what people can do to people I love. My own fans, who I adore and feel like have shaped who I am, will say the most hurtful things to me about how I live my life.”

She adds, “But he has the strength in him that none of that noise fazes him. It’s really impressive, and I just cherish every moment with him.”

In terms of where things are gonna go from here with BB, Selena says time will tell … but does say this about him, “I don’t know what the future holds, but I do know that he’s not going anywhere any time soon.”

Talk about a major change of plans … ya never know when the LOYL will crop up!