Both of us???

My boyfriend was talking to me yesterday and he used to have this friend a while ago before we started dating and they were really close and they considered being together, but then I came in, so he didn't talk to her as much and then she did some things and there were months they didn't talk to each other, which I was happy about because I've never really liked her, but they started talking again recently and he told me he wishes he could be with both of us and he doesn't want to make a decision.... I didn't think a decision had to be made, we've been together for about a year and six months now and I don't know what to do... And I'm feeling extremely self conscious and feel like I have to compete with this girl because she's better at me in almost everything, and I'm just so afraid I'm going to lose him πŸ˜”πŸ˜” any advice or just anything??? I'm very lost 
Update: my boyfriend and I have had some tough situations in the past and during a time I thought we were done he thought the opposite and I went behind his back and did a lot of things I shouldn't have, so ever since then he hasn't loved me the same and I can't blame him, in fact I hate myself for it, but I love him and I don't want to lose him, and I know I ****ed up... But after everything I've done he's stayed to try to work things out and I can't just leave him like this...