Is my bf in love with me?

I've complained about him sending his ex comments on myspace and still did it. we've been together 3 months. he said it's ok for me and her to meet someday-so it must really be platonic. But he hadn't been sending me comments only 1 in the past. When i complain he sends me a comment though. he mentioned marriage with me and living 2gether first. Should I stay. me and him get a long well. but I get too serious too fast. what to do?