struggling with motivation

Hello everyone, i am new to all of this so be patient with me :iamwithstupid:

So about a year ago me and my boyfriend made a pact to lose weight together, he is a fantastic motivater but the only issue is we can only work out together 2 days a week and quite often we are busy fitting in other social things. Since last year i have lost around 2 stone but i am currently stuck and 12st 12lb and i am really struggling to motivate myself on days i cant workout with the boyf, does anybody have any suggestions as to how i can kick my butt into action and be bikini ready for summer tia xx